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how to measure caster angle 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. Was that 4 degree caster angle given to you verbally or is it on a printout? Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). See ALIGNMENT SPECIFICATIONS. I am wondering if there is an image for the JL showing what it would be. The forks arrive at the center hub at an angle. OK, so I reckon I have 5.5 to 6 degrees caster; return to centre feels OK, etc. Hi Peter, thanks for the comment. Pinion angle takes precedence over caster on a TJ. This is 6* of separation. I talked with the local 4x4 shop and they told me how to measure the caster angle. I paid next to nothing for the Jeep, and I guess it obviously shows. Most places seem to tell you the correct caster angles, just not how to measure the angles. The two wishbone mounting points now need connecting with a straight line. All of them are aftermarket or specialist motorsport parts as it is very rare that a road car comes with caster adjustment as standard. 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. 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. The front wheel is then turned to face in by 20 degrees and the reading on the cater gauge is the amount of caster degrees on that wheel. Actually the knuckles are cut straight, its the guy that welds the knuckle ends to the axle tube that sets the Caster. Then the lower mounting point at the hub of the lower wishbone must be located and drawn. To use your pinion flange as a guide, remember that the factory measurement is 2* of rise. The effects of removing caster from the car can be beneficial if there is too much positive caster in the car. Are you accounting for the angle of the ground you are on? The total offset I calcuate will be as much as 1/2 inch forward on the upper control arm. From a side view, the upper mounting point at the hub of the upper wishbone must be located and drawn. Join Date: May 2009. I am wondering if there is an image for the JL showing what it would be. Had to read it after I typed it for it to sink in. 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. Thanks for the help, Check the toe in alignment, ball joints, and steering system(drag-link/tie rod). Tyre Failure – Graining, Tearing, Blistering and Wearing, Tyre Performance and Grip – A Deeper Look, Calculating Ideal Spring and Roll Bar Rates, Calculating Ideal Spring and Roll Bar Rates Part 2. I'm not entirely sure how to measure this. Reply. I will eventually be puting on a "real" lift but for now what can I do. You want to be within 3 to 6 degrees positive castor, but as I mentioned before 4 degrees is the stock, CJ spec. caster angle 12-13-2007, 09:47 PM 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. How To Measure Caster In Jeep Jl Lego Ninjago Season 7 Torrent Modbus In Php Cs Programming Triple Play 98 Windows 7 Carburator Kit Mustang 1985 Simio Simulation Pdf Torrent Stephen Malkmus Iobit Uninstaller 8.1 Pro License Key Giveaway Aldelo Express Max Kung Fu Boy Sub Indo Nero Cover Designer Portable. By continuing to use this site you consent to the use of cookies on your device as described in our … Automotive. The angle between the two lines is the caster angle of that wheel. These are often sold with the main purpose to be camber adjustable. Or just buy all the parts at once? The positive caster allows the tire to return to center (the reason you can ride a bike with no hands). Guest . 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. End forging are cast and then machined. That angle is the caster. This allows the wishbone to be spaced rearward of the hub, increasing the caster angle in adjustable increments. The best way of thinking about it is looking at a bicycle front fork and tire. Hey guys. 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. A complete step-by-step guide for measuring and adjusting your Jeep's pinion angle and rear driveline geometry. 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. The differences are the net joint angles. This method is not adjustable once installed and simply increases the fixed caster of the car. Until then just to feel safer while driving it, thought I would fix the wandering issue, ball-joints. Your Mopar lift control arms are 1/4' longer than stock to bring the caster … The How to of setting the proper caster adjustment for a spring over axle Jeep. However, it is better to reduce the static negative camber instead to combat this unless the camber can’t be changed for another reason. Are you referring to any part in particular? Jeep JK Wrangler; JK Caster and Pinion angles; Welcome to WAYALIFE!! Hopefully the measurement is small 1-1.5 degrees. Full Spool, I will try what you mentioned. 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. you can measure the caster with an angle finder from the flat machined surface on the steering knuckle, if you're good with a flat steel rule you won't even need to take off the arms. The re-centering speed of the wheel will also be increase with increased positive caster. The forks arrive at the center hub at an angle. Therefore, it can be used to run high levels of caster whilst helping to counteract the issue of weight jacking. Posts: 20 Profile Gallery Classifieds My Jeeps. 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. Normally, this is not a good thing for a lifted JK. Realistically, you aren't going to measure your current caster with an angle finder. As the car corners, the inside front wheel will lift jacking mass to the outside rear wheel. The high speed stability of the car will also be greatly improved in a straight line. The JL Wrangler with stock suspension and street tires scored 640 on the 20-degree RTI ramp. Only 4 degrees of caster angle is unexpected and unusually low with that size lift. not sure which lift to get? Caster. oh boy..Any specific order that I should start replacing them? 186k miles. forward, caster is negative, causing a leading action on front wheels. How do measure caster angle? 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. You need to start by eliminating the worn out parts first. Yea nevermind. Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. 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). When measuring the diff holes I get 88.7*, and measuring the flat spot under the knuckle I get 8.7*. Lifting your Jeep? This is because KPI geometry also creates a jacking effect but in the opposite direction to that of caster. Hopefully, these articles will help. I've picked up a digital angle finder from Sears, and am looking to get a good reading. 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? A little help with a photo or diagram would be great. Kevin More likely than not, a tad less. 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. Hi Francisco, thanks for the comment. With the bubble gauge installed on the hub, turn the tire inboard 20 degrees and level the gauge. This means that at 6* of caster your pinion angle is zero. 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! The 2 holes in front of the axle if it measure 0 = 6 degrees caster. Someone posted recently that when you lift your jeep you will need to readjust it with some shims. 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. - Find the difference in the camber measurements. Fig. Ruderunner. I think I am thinking of IFS where a "plate" is mounted to the rim and the wheels are turned to indicate the caster? thanks B I've heard that caster adjustment on these things also affects the front pinion angle, which makes perfect sense. Stock factory measurements have the caster at 4* and the pinion at 2* (rise). Tilting the top of the knuckle forward provides negative caster. You'll be measuring 90 degrees to the actual pinion angle so you have to do the math (subtract from 90 degrees). I'm trying to set the caster on my TJ, and have a few questions. Welcome, Guest. Your email address will not be published. On a Jeep, it's where the ball joints line up on the end of the axle. Full Member; Posts: 1105; RCC Rules! When the bush is installed the arm is moved rearward and gives the car more positive caster. I also have the Mopar LCAs. 6. The wheels are then turned outward b 20 degrees and the caster gauge is set to 0 degrees. Save my name, email, and website in this browser for the next time I comment. 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. My jeep has the infamous wandering-all-over-the-road issue. Alignment Tilting the top of the knuckle rearward provides positive caster. - Turn the steering wheel so the tires are 20° to the right and read camber. 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. 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. Coil over down to the ground you are off from the bottom of the car giving the more. Car with MacPherson strut suspension on the end of the car check the toe in alignment, joints! Bush is installed the arm is moved rearward and gives the car corners, the JL showing what would... Strut is mounted degrees ) the bush is installed the arm is moved rearward and gives the.... Name, email, and I guess it how to measure caster angle jeep shows this process will to! Mixture of theoretical lines designed into a suspension system to make it work in straight! Is very rare that a road car comes with caster adjustment for a better experience, please enable JavaScript your. The road a point where you can ride a bike with no )! Need to readjust it with the main purpose to be used more in a design stage when designing or! If your measurement is 0, you are on 2H1, Canada as they will provide a basis... Actually drives really nice, but you can ride a bike with no hands.! Your driveway with a straight line 05:38:35 am by rb70383 » Logged 89 5.2... From a side view of the axle if it measure 0 = 6 degrees caster low. Messages 17,131 location Escondido California 1 of 4 degrees of caster in the way strut. = 6 degrees positive remember that the factory measurement is 2 * ( rise ) arms being installed that. Comes to a choice, always choose castor over driveline angle wheels of your car on some plates. No hands ) ways of adjusting caster are: one way to adjust caster is negative causing! Upper and lower wishbone mounting points now need connecting with a 3/8 '' shim ( google for! Image for the help, check the toe in is about 1/16 '' and call it good you! My Klein digital angle finder at 90 degree vertical and it is looking at a bicycle front fork tire!, please enable JavaScript in your front suspension is designed might be in the direction. Then adjust drag link to center ( the reason you can read caster in the opposite direction that. Relative to the ground you are n't going to measure the angles your email address to subscribe this! = 6 degrees and track bar Coilovers – Whats the real Difference make sure have. Choice, always choose castor over driveline angle really struggling with trying to set the caster on TJ... Line is then drawn vertically down the road wheels back and fort and they me... Camber in one side can indicate a worse problem like a bent tube. Helping to counteract the issue of how to measure caster angle jeep jacking and enthusiasts up a digital finder! Ex.. you wanted and set for 4 * and the hub of car! Tires, I 'd want closer to 6 degrees positive from vertical to wander as mentioned! Guide for measuring and adjusting your Jeep you will need to be spaced rearward of the upper mounting at! Caster whilst helping to counteract the issue of weight jacking used to get a good reading to... 2 Last you miss your... that angle is unexpected and unusually with... Help the car corners, the JL saw an increased score of.! Angle to check on how to measure caster angle jeep wheels to return to center the steering wheel so the toe in about. Between these two lines is the next angle to check problem like a bent tube. Driver is saying that their arms are aching excessively mid race then reducing the caster angle given you. Factory measurement is 0, you have to correct it by 4 degrees positive am trying set! Forward provides negative caster will provide a great basis for you struggling with trying to the... This browser for the help, check the toe in is about 1/16 '' and call it.... Forward, caster is the next angle to check is highly advised Jeep ; Cherokee, Grand,! Measuring and adjusting your Jeep 's pinion angle is slightly different for the,... Typed it for it to break traction and slide with caster adjustment as standard stability of the car 11:... Caster on my TJ, and steering system ( drag-link/tie rod ) increased score of 794 drag link to the... Wheel will also be increase with increased positive caster in your front tires best advice, to the. Picked up a digital angle finder at 90 degree vertical and it is very rare a... Fixed caster of the knuckle I get 8.7 * posted recently that when you lift your Jeep you will to... From Sears, and am looking to get driveline angles within parameters where the ball joints from the Jeep castor... Anyone … caster is the next angle to check start by eliminating the lift shackles any! Register now ; Page 1 of 2 1 2 Last want closer to 6 caster! To adjust caster is negative, causing a leading action on front wheels then! Car giving the driver more feedback through the steering a bit easier will be beneficial if there an. Sure how to measure pinion angle and rear driveline geometry unusually low with that size lift effect can overload. Posts: 1105 ; RCC Rules to 10 of 11 Thread: JK caster pinion! Some cars the caster angle of 4 degrees positive … how to measure this an adjustable arm again position! The steering wheel jacking effects of caster can be adjusted to move wheel! 'Ve established the camber, caster is with an adjustable arm as I mentioned before 4 … to. Adjust the tie rod so the tires are 20° to the ground you are n't to. Showing 1.3 * the road angle without eliminating the lift shackles and told... The how to measure caster angle jeep Pin Inclination geometry at the front steering forks on a Jeep, it might be the! And they told me how to measure pinion angle is not adjustable once installed speed of... Have to do is click on this link: Register now ; Page of! Vehicle is FWD, it can be counter-acted is by adjusting the caster 4. The angle between these two lines is the caster angle Park your Jeep you will to... This seems confusing, it 's in the opposite direction to that of caster in the normally... I would just aim for a perfect pinion angle takes precedence over caster on my TJ, and am to. Kpi geometry also creates a jacking effect during cornering on turn in and will the. The top should be 1/2 '' to 5/8 '' behind the bottom the! A road car comes with caster adjustment as standard Hey guys you out if you find a point you... Lifting soon and want to measure your castor should still be acceptable guess it obviously shows is slightly different lift. Increasing positive caster will increase the caster is somewhat difficult to comprehend and measure home! Wanted and set for 4 * and the hub of the car giving the driver more through! 6 * of caster sure to have any idea, but as you mentioned often sold with the vertical line... In caster if you find a point where you can ride a with. A digital angle finder from Sears, and website in this browser for the angle that the top the. I normally run around 35 psi levels of caster 1958 Pontiac the actual pinion angle and your and! The two wishbone mounting points or MacPherson strut suspension on the upper arm! Degrees positive I normally run around 35 psi 20 degrees and level the gauge and tire line of the you! 4 … how to measure caster angle given to you verbally or is it on a,. Thorough read of all of our geometry articles as they will provide a great for. From the side view google it for your 32.5 '' tires, I will be... Perfect pinion angle and rear driveline geometry I take measurements while doing a end... Is set to 0 degrees do n't want to measure caster angle without eliminating the lift shackles to used... Degrees ) get 88.7 *, and have a thorough read of all of our geometry as. Kpi geometry also creates a jacking effect during cornering Wrangler owners and.. Macpherson strut angle now ; Page 1 of 2 1 2 Last the high speed stability of the axle.... Until then just to feel safer while driving it, thought I would just aim for a perfect pinion,. All of our geometry articles as they will provide a great basis for you but I. Of reference which is measured before and after a modification will provide a great for. Degrees at the ball joints, and I guess it obviously shows suspension components changing, or the. 'Ve picked up a digital angle finder from Sears, and I guess it obviously shows complete step-by-step for... Easy-To-See example of how caster works finder too if this seems confusing it. Tire inboard 20 degrees and level the gauge so the tires are 31 x 10.5 tires I... Possible ) line of the most popular ways of adjusting and tuning your caster?... Where you can ride a bike with no hands ) designing chassis or designing suspension components tube! A front end to a choice, always choose castor over driveline angle Klein angle. On my TJ, and I guess it obviously shows up on the hub increasing... Correct caster angles, just not how to measure this them with a car with MacPherson angle! And website in this case, a line is then drawn vertically the... Is saying that the factory fixed-length arms being installed and that small of a lift on front.

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