Originally Posted by wayoflife

LOL!! looks like everyone already covered all the bases.

the truth of caster is that the more you can get, the better your jeep will drive/handle on pavement. the problem is, the more caster you have, the greater the angle your front driveshaft will be where it hooks up to the pinion and this will give you vibrations and big time so if you have an aftermarket u-joint style shaft. so, the real issue regarding caster is how much can you add to get the best possible handling and without creating vibes and from experience, about +6° is where you want to be or at least with a +/- 3" lift and 35's. if you are still running a stock shaft, you can get more in but it really isn't necessary. if you have an aftermarket shaft and are over 4" of lift, you might have to reduce this all the way back to stock which is +4.2°.

regarding death wobble, yes, a lack of positive caster can cause it to occur. you ever get a shopping cart at the grocery store with a bum wheel? that is essentially DW. however, so long as you have at least stock caster, this should not be a problem.

Originally Posted by JK Freedom

If you were in my situation (stock Rubi wheels and tires, RC 4" lift and stock drive shafts) what caster would you put???

Originally Posted by wayoflife

with 4" of lift, i would try to get to +6° if you can and back off from there if you have vibes.



i wouldn't do this. your lowers should always be equal. some adjustment can be made to upper arms but being that we have solid axles, not much can be done there. regarding the pull, most people that i know who have it also have camber due to bent c's and me being one of these people. the correct solution is to fix this problem with off set ball joints - NOT shifting the axle with control arms.

Originally Posted by wayoflife

the truth of caster is that the more you can get, the better your jeep will drive/handle on pavement. the problem is, the more caster you have, the greater the angle your front driveshaft will be where it hooks up to the pinion and this will give you vibrations and big time so if you have an aftermarket u-joint style shaft. so, the real issue regarding caster is how much can you add to get the best possible handling and without creating vibes and from experience, about +6° is where you want to be or at least with a +/- 3" lift and 35's. if you are still running a stock shaft, you can get more in but it really isn't necessary. if you have an aftermarket shaft and are over 4" of lift, you might have to reduce this all the way back to stock which is +4.2°.

Originally Posted by JK Freedom

Sorry, I'm French, therefore I wan't to be sure that I well understood:
With a stock shaft, I can put more positive caster than with an aftermarket shaft?
Right?

Originally Posted by wayoflife

yes and no. it really depends on how much lift you have. so long as you are working within the operating angle of the cv joint, you can have it sit at a slightly steeper angle and without there being vibes. if you have a stock height to 3" lift and have a factory shaft, you can give it more positive caster and without any problems. of course, if you have an automatic, you will need to change out your front shaft if you have 3" or more of lift.

Originally Posted by Ridin' Dirty

I got a X with 3 inch terra flex kit and stock control arms and was thinking about adjustable uppers instead of lowers to get the caster back. I have the usual symptoms, flashy, darty, death wobble, and was thinking it might be better to pull back on the top instead of extending the bottom to steer clear of the drive shaft issues. My fiance is half afraid to drive it. What do you think??
Dave

Originally Posted by JK Freedom

Thanks Wayoflife

If you were in my situation (stock Rubi wheels and tires, RC 4" lift and stock drive shafts) what caster would you put???

One last thing: Some Jeepers adjust 1/8" longer the front lower arm (passenger side) to eliminate the tendency of the Jeep to pull to the right. Is it an important thing to do?

Originally Posted by JackMac4

JK Freedom, with my Teraflex 4" lift on my 2dr Rubi I first had it at 3.5 and it was aweful. Now I'm at 5 and its good, but I get vibes at 65mph. I'm going to back it down to 4.5 and hope for the best. Hope that helps.

Unfortunately its just something you gotta keep playing with until its perfect.

Originally Posted by JK Freedom

You get vibes at 5 deg. maybe because you have a two door; therefore the angle of the cv joint is higher