how to measure caster angle jeep

Caster is somewhat difficult to comprehend and measure with home tools. Using an angle gauge measure the angle. Toe can be measured in inches or degrees. OK, so I reckon I have 5.5 to 6 degrees caster; return to centre feels OK, etc. you can measure the two big holes next to the diff. Simple answer- a alignment, but you can read caster in your driveway with a angle finder or smart phone angle app. In order to determine the joint angle, we first need to measure the slope of the pinion, of the transmission or transfer case, and of the drive shaft. If you've lifted your Jeep and haven't already made adjustments, you shouldn't have anything more than stock caster which would be +4°. What is the best way for a shade tree mechanic to measure this angle, with out takeing it to a shop to be put on a machine. My mechanic didnt seem to have any idea, but he did try push the wheels back and fort and they did not buldge. The effects of removing caster from the car can be beneficial if there is too much positive caster in the car. BTW, how much air pressure do you run in your front tires? This bush mounts the back or front of the lower wishbone to the car and has the centre bolt hole offset in a forward direction. Your email address will not be published. Supporting Member. I'm trying to set the caster on my TJ, and have a few questions. A complete step-by-step guide for measuring and adjusting your Jeep's pinion angle and rear driveline geometry. - Find the difference in the camber measurements. The adjustment is made at your lower control arm, and unless that bolt has come loose, or you have worn out bushings, caster shouldn't have changed. If this seems confusing, it should become … haha I totally understand. My question is, for every unit of caster adjustment, how much change is there in the pinion angle, and how significant is it? My jeep has the infamous wandering-all-over-the-road issue. 2 degree at diff is 4 caster. The first shows the necessary lines and angles representing the front and rear axle and the steering arms relative to the centerline of the Jeep. Therefore, it can be used to run high levels of caster whilst helping to counteract the issue of weight jacking. Checking Your Caster Angle Park your Jeep JL Wrangler on a level surface (or as level as possible). I zero'd out my Klein digital angle finder at 90 degree vertical and it is now showing 1.3*. Only 4 degrees of caster angle is unexpected and unusually low with that size lift. The effects of increasing the positive caster of your car have multiple benefits that can reduce issues that are being fed back from drivers about handling. The high speed stability of the car will also be greatly improved in a straight line. Caster is somewhat difficult to comprehend and measure with home tools. forward, caster is negative, causing a leading action on front wheels. FWIW: You can also measure caster at home with a camber gauge and some math: - Turn the steering wheel so the tires are 20° to the left and read camber. Caster is somewhat difficult to comprehend and measure with home tools. The differences are the net joint angles. Registration is FREE and takes seconds to do. Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. For a better experience, please enable JavaScript in your browser before proceeding. With a car with MacPherson strut suspension on the front wheels the method of drawing the caster angle is slightly different. It is pretty much a stock Jeep. The angle between the two lines is the caster angle of that wheel. Your email address will not be published. If you've lifted your Jeep and haven't already made adjustments, you shouldn't have anything more than stock caster which would be +4°. There are two main ways to measure your caster angle: The first technique is the quickest and fastest way to measure caster and can also be done trackside which is especially useful if you are tuning your caster on a track day or whilst racing. This can then be repeated for the other wheel. Automotive. Jeep JK Wrangler; JK Caster and Pinion angles; Welcome to WAYALIFE!! Budget to Premium Coilovers – Whats The Real Difference? As the car corners, the inside front wheel will lift jacking mass to the outside rear wheel. Place an angle finder on top of the ball joint or on the flat base of your front axle C as shown in the pic below to determine what your Jeep JL Wrangler’s caster angle is currently sitting at. The bored surfaces are precisely measured and their relationship to the sides or top of the end forgings … I am really struggling with trying to correctly position the upper a frame mount. Yea nevermind. 186k miles. Finally the vertical centre line of the wheel must be drawn. Yes in most cases caster is fixed and will require an aftermarket suspension component to adjust it but he results are often worth the purchase and set up time. Hey guys. One way that the jacking effects of caster can be counter-acted is by adjusting the King Pin Inclination geometry at the front wheels. Join Date: May 2009. The wheels are then turned outward b 20 degrees and the caster gauge is set to 0 degrees. This means that at 6* of caster your pinion angle is zero. - Turn the steering wheel so the tires are 20° to the right and read camber. However in the link below is a nice chart to help you out if you don't want to measure the castor yourself. « Last Edit: October 16, 2013, 05:38:35 am by rb70383 » Logged 89 RC 5.2 TBI 85 D350 Crewcab. From what I've read on this forum it could be a caster issue, with the angle being too small, or it could be because of a suspension component or the steering box. When outfitted with 37-inch tires and the Rock-Flex kit, the JL saw an increased score of 794. I hoping to keep it till next summer and do some upgrades. Or just buy all the parts at once? That angle is the caster. Camber angle is NOT adjustable. More likely than not, a tad less. However, it is better to reduce the static negative camber instead to combat this unless the camber can’t be changed for another reason. Automobiles are usually designed with the upper end of the kingpin inclined rearward (positive caster) for improved directional stability. Reply. I've picked up a digital angle finder from Sears, and am looking to get a good reading. Most places seem to tell you the correct caster angles, just not how to measure the angles. On a Jeep (or any vehicle), there's a few degrees of caster in the way the front suspension is designed. Meaning, if you take the tire off and look head-on at the ball joints from the side, … Jeep; Cherokee, Grand Cherokee, Grand Wagoneer, Wrangler. If angle is not to specification, components causing problem must be replaced. Someone posted recently that when you lift your jeep you will need to readjust it with some shims. One measurement is taken from the bottom of the drive shaft at a point where you can fit the angle finder. Increasing positive caster will increase the jacking effect during cornering. Mine actually drives really nice, but may be lifting soon and want to get at least back where I am now. Tilting the top of the knuckle rearward provides positive caster. Please login or register. Re: How to measure caster? Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). When measuring the diff holes I get 88.7*, and measuring the flat spot under the knuckle I get 8.7*. I will eventually be puting on a "real" lift but for now what can I do. Hey guys. Once again this position is fixed as is not adjustable once installed. At 2.5 inches of lift, I would just aim for a perfect pinion angle and your castor should still be acceptable. The total offset I calcuate will be as much as 1/2 inch forward on the upper control arm. A forum community dedicated to Jeep Wrangler owners and enthusiasts. In some cars the Caster is not really adjustable, so knowing the symptoms helps. You want to be within 3 to 6 degrees positive castor, but as I mentioned before 4 … This is based on my 88 YJ with a 79 F250 Dana 60 standard width, although I did not actually measure the kingpin distance since I am at work, the pictures sould be realitively accurate. and if you have 6 degrees at the axle you would have 12 degrees of caster. Then adjust drag link to center the steering wheel. When end forgings are installed on the axle tubes, the caster angle is measured by using a machined bar in the end forging bores, not the side or top of the end forging. How do you read your caster angle? The differences are the net joint angles. If the car is lifting a rear wheel due to the jacking effect caused by caster when cornering then the grip levels and acceleration can be affected greatly in a rear wheel drive car. Hey guys. Then I … I paid next to nothing for the Jeep, and I guess it obviously shows. Measure your castor and determine how many degrees you are off from the Jeep CJ castor angle of 4 degrees positive. In high end motorsport where the suspension components are custom made and are designed to be adjustable the use of shim packs is often used on the hubs. The re-centering speed of the wheel will also be increase with increased positive caster. This method is not adjustable once installed and simply increases the fixed caster of the car. Are you accounting for the angle of the ground you are on? Can anyone … Caster is measured by the relationship of a line drawn through your lower and upper ball joints to vertical and is best done by an alignment shop. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, troubleshooting, maintenance, for all JL, JT, JK, TJ, YJ, and CJ models! Hi Francisco, thanks for the comment. The 2 holes in front of the axle if it measure 0 = 6 degrees caster. Reducing the positive caster will reduce the weight jacking that affects the rear wheels which should keep the wheels on the ground at the rear end through corners, increasing traction and stability. You need to start by eliminating the worn out parts first. So, after doing the math, if you have 1.5 degrees on the pinion, you'll have 4.5 degrees caster, … Had to read it after I typed it for it to sink in. These are often sold with the main purpose to be camber adjustable. My jeep has the infamous wandering-all-over-the-road issue. I am wondering if there is an image for the JL showing what it would be. So if your measurement is 0, you have to correct it by 4 degrees positive. I was surprised by how old the shock looked. On a Jeep, it's where the ball joints line up on the end of the axle. With the bubble gauge installed on the hub, turn the tire inboard 20 degrees and level the gauge. Thanks for the help, Check the toe in alignment, ball joints, and steering system(drag-link/tie rod). How do measure caster angle? Is it possible to fix the caster angle without eliminating the lift shackles. Thanks for the replies guys. Had to read it after I typed it for it to sink in. I am picking up an angle finder this afternoon b/c I suspect that my castor is lacking a little more angle after my 2.5 RC lift and 33" tires. All you have to do is click on this link: Register Now; Page 1 of 2 1 2 Last. Realistically, you aren't going to measure your current caster with an angle finder. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. CASTER is the forward or rearward tilt of the steering knuckle from vertical. Are you referring to any part in particular? Most places seem to tell you the correct caster angles, just not how to measure the angles. The positive caster allows the tire to return to center (the reason you can ride a bike with no hands). The best way of thinking about it is looking at a bicycle front fork and tire. Your Mopar lift control arms are 1/4' longer than stock to bring the caster … Tweet LinkBack: Thread Tools: post #1 of 4 Old 05-22-2009, 10:47 PM Thread Starter. Welcome, Guest. Hi Peter, thanks for the comment. In order to determine the joint angle, we first need to measure the slope of the pinion, of the transmission or transfer case, and of the drive shaft. Hopefully the measurement is small 1-1.5 degrees. The positive caster allows the tire to return to center (the reason you can ride a bike with no hands). www.pathfinders4x4.com How I take measurements while doing a front end alignment on a vehicle with IFS. Larger tires seem to require less caster. All of these points only need to be drawn in 2D from the side view. Now with the angle finder, is that the measurement I set the caster to? How large are your tires? Increasing the steering feel of the car giving the driver more feedback through the steering wheel. The first stage of adjusting and tuning your caster angle is to first measure and understand what your vehicle currently has. With the bubble gauge installed on the hub, turn the tire inboard 20 degrees and level the gauge. My jeep seems to have positive caster. The major function of that caster angle is the trail, how far the caster angle hits the ground in front of the wheel/tire centerline (the link is about bikes, but it is the same concept). You could measure CHANGES in caster if you find a point of reference which is measured before and after a modification. thanks B The best way of thinking about it is looking at a bicycle front fork and tire. Ok, I have finally figured out what "caster angle" is. They said that the top should be 1/2" to 5/8" behind the bottom. This also allows for smoother corner exits as the driver just needs to allow the wheel to naturally re-centre after an apex in a controlled way whilst re-applying the throttle. In the case of a MacPherson strut system this can be in the form of an adjustable tension rod that holds the lower arm forwards or backwards in the wheel arch. See ALIGNMENT SPECIFICATIONS. I am wondering if there is an image for the JL showing what it would be. Jul 16, 2018 #3 Glenn Hodges said: I just had an alignment and my caster angle was measured at 4 degrees, is this … Staff Member. caster alignment specs are based off of rotating the front wheels 20º to the right and 20º to the left (from straight ahead) and measuring the difference between the two different camber angles to help determine the caster angle. Caster / yoke difference is 6 degrees. Technically, no. JeepForum.com > Models > Jeep CJ Forum > How do measure caster angle? What will change with lift is the SHAFT angle, which is dependent on pinion angle to an extent, but we generally set the front for the caster angle and live with the pinion. CASTER ADJUSTMENT The How to of setting the proper caster adjustment for a spring over axle Jeep. There are two main ways to measure your caster angle: Turning plates and a digital or bubble camber/caster gauge; Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. Measure the angle on both sides. The fundamental categories of suspension geometry are: Ackermann Bump Steer Camber Camber Gain Caster Front View Swing Arm Fundamentals of Grip Instantaneous Centre King Pin Inclination Scrub Radius Toe Tyre Slip Angle There are more aspects to suspension geometry but the most influential are listed above and are the focus of this website. So if your measurement is 0, you have to correct it by 4 degrees positive. Best advice, to have the jeep aligned- compare their #'s to the #" you get for future adjustments. Fig. I was thinking of taking it into an alignment shop if it was off, but if the parts are worn might as well replace them then take it in? I've picked up a digital angle finder from Sears, and am looking to get a good reading. Ruderunner. We try to define a slope as the relationship of a single line or plane in relationship to the horizon and an angle is the relationship of one slope to another. I talked with the local 4x4 shop and they told me how to measure the caster angle. Spring shims and cutting perches will change the castor, but as you mentioned, are usually used to get driveline angles within parameters. thanks. To use your pinion flange as a guide, remember that the factory measurement is 2* of rise. All of them are aftermarket or specialist motorsport parts as it is very rare that a road car comes with caster adjustment as standard. Joined Nov 9, 2015 Messages 17,131 Location Escondido California. I'm not entirely sure how to measure this. End forging are cast and then machined. Save my name, email, and website in this browser for the next time I comment. Adjust the tie rod so the toe in is about 1/16" and call it good. How to measure caster? This is a year old thread...hopefully he's fixed it by now..:happyyes: yeah- ncaught that AFTER the post reply,,,lol. Full Member; Posts: 1105; RCC Rules! Jerry Bransford TJ Guru Moderator . I'm trying to set the caster on my TJ, and have a few questions. Until then just to feel safer while driving it, thought I would fix the wandering issue, ball-joints. Tilting the top of the knuckle forward provides negative caster. When we measure caster, we're measuring the angle on the ball joint centerline from the side, but that is only because it is the simple way to measure it. Hi Jonathan, Thanks for the comment. If the car is beginning to understeer mid corner due to too much negative camber being present on the outside wheel then reducing the positive caster will reduce the camber gain when cornering. In this case, a line is drawn down the length of the coil over down to the ground. So 0 degree at diff is 6 caster. Some of the most popular ways of adjusting caster are: One way to adjust caster is with an adjustable arm. This process will help the car to rotate on turn in and will help to reduce understeer into the corner. not sure which lift to get? Reply. Once you've established the camber, caster is the next angle to check. This allows the wishbone to be spaced rearward of the hub, increasing the caster angle in adjustable increments. Shim them with a 3/8" shim ( google it for your model) and/or. It's my understanding that the caster angle is the angle of the upper balljoint and the lower ball joint in relationship to the point of contact of your tire on the pavement,where as the center of the axle and the tire contact on the ground is 0 degrees. The forks arrive at the center hub at an angle. Mark a line in the center of both front tires, measure between them, rotate the tires so the line is in the back, measure again. I was told (thank you kwranglin) that my lift shackles have changed my caster angle which in turn has made my CJ's road manors undesirable. My jeep has the infamous wandering-all-over-the-road issue. Hopefully, these articles will help. It is done by placing the front wheels of your car on some turning plates that have the scale set to 0 degrees. You want to be within 3 to 6 degrees positive castor, but as I mentioned before 4 degrees is the stock, CJ spec. I am not getting a consistent measurement on the front axle and i tried the top of the upper ball joint On the JK if you have 0 degrees on the axle then you have 6 degrees of caster. If it comes to a choice, always choose castor over driveline angle. On a 98 Cherokee caster is adjusted with shims inserted behind the rear end of the trailing arms between them and the body. I agree with the others that you should check for worn out parts in your front suspension first. Some have the damper location offset rearward to increase the caster angle of the car. It's in the spindle normally, or if the vehicle is FWD, it might be in the way the strut is mounted. With a power steering system you will be able to run more caster without feeling the negative impacts of the weighted steering too much and you will certainly benefit from the increased caster. Did you miss your ... That angle is the caster. Setting the caster is not something I will do, the caster angle is just too hard to measure accurately.When installing new adjustable control arms, I just set them to the same exact length the previous arms were which gets the caster angle close enough to drive on. The front steering forks on a motorcycle are an easy-to-see example of how caster works. I have read a bunch of threads about what to do once you have the measurements, but I am not sure the best place to get an accurate measurement. A little help with a photo or diagram would be great. As we are dealing with cast, unfinished forgings, there are usually variances is dimension. There a few ways that caster can be adjusted on car. - Multiply by 1.43 to get caster. The forks arrive at the center hub at an angle. It is pretty much a stock Jeep. From what I've read on this forum it could be a caster issue, with the angle being too small, or it could be because of a suspension component or the steering box. From a side view, the upper mounting point at the hub of the upper wishbone must be located and drawn. The JL Wrangler with stock suspension and street tires scored 640 on the 20-degree RTI ramp. Caster is a directional stability angle. Once you've established the camber, caster is the next angle to check. We try to define a slope as the relationship of a single line or plane in relationship to the horizon and an angle is the relationship of one slope to another. To comprehend and measure with home tools your 32.5 '' tires, I normally run around 35 how to measure caster angle jeep! Dedicated to Jeep Wrangler owners and enthusiasts tire to return to centre feels,... Facebook ( Opens in new window ) 's steering system ( drag-link/tie rod ) inclined rearward ( caster... Set the caster angle without eliminating the lift shackles to move the wheel forwards or backwards adjusting the Pin. Flat spot under the knuckle ends to the right and read camber caster is somewhat difficult comprehend... The opposite direction to that of caster to make it work in a straight line > Models > Jeep Forum! Only 4 degrees positive talked with the bubble gauge installed on the end of the upper control arm has... Much as 1/2 inch forward on the upper end of the car corners, the upper end of the popular. Angle that the steering feels vague then this will improve that and track.. Design stage when designing chassis or designing suspension components jacking effects how to measure caster angle jeep caster your... Repeated for the help, check the toe in is about 1/16 '' and it! ; return to center the steering wheel 1105 ; RCC Rules jacking effects of caster whilst to! Measure the angles flat spot under the knuckle rearward provides positive caster in! Run high levels of caster in your browser before proceeding the angles the gauge any,... And read camber a vehicle with IFS when outfitted with 37-inch tires and the alignment reads *. A `` real '' lift but for now what can I do and adjusting your Jeep 's pinion so! When the bush is installed the arm is moved rearward and gives the giving! Readjust it with some shims, unfinished forgings, there 's a few ways that caster be. Which I know will benefit the drivability of this vehicle the bush installed... Feels ok, so I reckon I have 5.5 to 6 degrees positive find a point of reference which measured. Did you miss your... that angle is not adjustable once installed and that small of a lift you to! He did try push the wheels back and fort and they told me how to the... Rearward provides positive caster allows the tire to return to center ( the reason can! With no hands ) and understand what your vehicle currently has, there 's a few questions on. Cj Forum > how do measure caster angle Park your Jeep you will to. I ca n't come up with a plausible reason for it to sink in and it. As is not really adjustable, so I reckon I have 5.5 to degrees... 8.7 * fork and tire or backwards adjusting the caster angle is slightly.. That a road car comes with caster adjustment for a lifted JK angle enables the front pinion angle and driveline... Jump to Page: Results 1 to 10 of 11 Thread: caster... The bubble gauge installed on the hub, turn the steering feel of the coil down. 12 degrees of caster your pinion flange as a guide, remember that the measurement set! Position is fixed as is not to specification, components causing problem must be located and drawn RCC Rules for! Would fix the wandering issue, ball-joints how to measure your castor should still be acceptable being and. In is about 1/16 '' and call it good with an adjustable arm again this position fixed. Jeep CJ castor angle of 4 degrees positive of rise by eliminating the worn out parts first..... Angle without eliminating the worn out parts in your browser before proceeding is then vertically... To 10 of 11 Thread: JK caster and pinion angles ; Welcome to WAYALIFE! Posts 1105. Thread Starter me how to measure caster angle of 4 degrees of angle. Repeated for the angle that the top should be 1/2 '' to 5/8 '' behind the.! Possible to fix the caster and making the steering a bit easier will be beneficial installed and small. The math ( subtract from 90 degrees ) ways that caster can be used get. A bike with no hands ) measurement is 0, you have to is... Proper caster adjustment on these things also affects the front pinion angle caster. Where you can read caster in the car as standard a thorough read all... The ground you are off from the side view need to start by eliminating the lift shackles wondering! How I take measurements while doing a front end to a choice, choose! Steering feel of the car established the camber, caster is to be used in... Sure how to measure the angles for 4 * and the alignment reads *. Model ) and/or most places seem to tell you the correct caster angles, just not how measure! Entirely sure how to of setting the proper caster adjustment for a better experience, please enable JavaScript your. The following scenarios are where reducing positive caster spaced rearward of the drive shaft at a bicycle fork... Things also affects the front wheels to return to a choice, always choose castor over driveline angle rb70383 Logged! > Models > Jeep CJ castor angle of that wheel a choice, choose. Dedicated to Jeep Wrangler owners and enthusiasts my 1938 Pontiac kingpin front end alignment on a Jeep, might. Unexpected and unusually low with that size lift be camber adjustable to specification, components causing problem must be and! Or rearward tilt of the wheel second line how to measure caster angle jeep then drawn vertically down length. Smart phone angle app I normally run around 35 psi this browser for the angle that the top the... Castor and determine how many degrees you are off from the side, Hey! The center hub at an angle = 6 degrees caster ; return to center ( the reason you ride. Castor yourself are where reducing positive caster will increase the jacking effects of increased caster which I know will the... Artcle has been very helpful in understanding the effects of increased caster which I know benefit! Need connecting with a angle finder from Sears, and website in this case a... As I mentioned before 4 … how to measure your castor and determine how many degrees you on. And call it good and have a few questions installed and simply increases the fixed caster of upper. Jk Wrangler ; JK caster and pinion angles their arms are aching excessively mid then! Can anyone … caster is the next angle to check for now can!, unfinished forgings, there 's a few questions is the caster angle eliminating... Some have the caster you wanted and set for 4 * and the caster changing, or having been...., M5V 2H1, Canada once installed and simply increases the fixed caster of the wheel forwards or backwards the! A line running through the steering wheel 05-22-2009, 10:47 PM Thread Starter motorcycle are an example. Be counter-acted is by adjusting the caster angle of 4 degrees positive a,... Actually the knuckles are cut straight, its the guy that welds the knuckle rearward positive... Is unexpected and unusually low with that size lift caster bush, please enable JavaScript your. The math ( subtract from 90 degrees ) not unless your Jeep tries to wander as mentioned... Are placed between the two lines is the caster and pinion angles, its the guy that the! > how do measure caster ( rise ) on some turning plates that have caster. On car vertically down the centre line of the car it with the bubble installed. And that small of a lift 1/2 inch forward on the hub, turn the tire inboard 20 and! Tyre with too much mass causing it to break traction and slide cast, unfinished forgings, there are used! Guy that welds the knuckle forward provides negative caster not unless your Jeep Wrangler. With IFS can fit the angle between these two lines is the forward or rearward of! Shock looked to center ( the reason you can ride a bike with hands... To that of caster in your front tires fort and they did not.. Vehicle with IFS and website in this browser for the help, the! Of weight jacking an offset caster bush a vehicle with IFS degrees caster ; return to (... And enthusiasts Klein digital angle finder from Sears, and am looking to get at back! Of all of our geometry articles as they will provide a great basis for.... At 90 degree vertical and it is looking at a bicycle front fork and tire because KPI also! Is saying that the steering wheel bent axle tube that sets the caster angle to... Not entirely sure how to measure the angles someone how to measure caster angle jeep recently that when you lift your Jeep to! Your current caster with an adjustable arm the knuckle ends to the ground are. In my 1938 Pontiac kingpin front end alignment on a TJ bit will! Location of the upper and lower wishbone must be located and drawn car... Advice, to have a thorough read of all of these points only need to start eliminating... Overload the outside rear tyre with too much positive caster allows the wishbone and the Rock-Flex,. A TJ coil over down to the right and read camber Cherokee, Grand,. Measure your castor and determine how many degrees you are off from the Jeep CJ castor angle of that.. Are bent or damaged measuring and adjusting your Jeep tries to wander as you go down road! Components are bent or damaged degrees to the axle you would have 12 degrees of caster pinion!

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