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post #1 of (permalink) Old 05-02-2000, 09:21 AM
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Tapered shims

Has any one used tapered shims on thier Dana 30 front springs to get more caster? I know they use them
in the rear to help drive line angles. What would be a good setting for a jeep with a 3in lift and 33"s. to help
it track stright?

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post #2 of (permalink) Old 05-02-2000, 09:48 AM
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Re: Tapered shims

Yeah, you can buy caster shims for your front axle. Check with a reputable alignment shop to be sure on the degree of caster. I think 76-79 CJs have 3 degrees of positive caster and 80-86 have 6 degrees...dont know why the difference, but I think thats what I remember the shops telling me. BUT, I'm not sure thats what your problem is. If you just put 3" lift but kept your stock shackle length, your caster shouldn't have changed. Extended shackles can definately change caster though. Have any other info that might help in diagnosing the cause?
Shain

post #3 of (permalink) Old 05-02-2000, 10:19 AM
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Re: Tapered shims

The jeep has 3/8 shackles all the way around, Black Diamond three in. lift, Agr super box 2 steering box and pump.Droped
pitman arm BFG 33"s mud tires. The Jeep steering seems to sensitive. I took it to be alined and the camber on the left was
.2 and the right was .9 the caster was 2.1 on the left and 1.8 on the right. All he did was adjust the toe in.
All the steering linkage is tight. When I go around a corner the Jeep does not return to center, I have to steer it back oncorse.
Any help would be greatly appreciated.
Thanks Bill

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post #4 of (permalink) Old 05-02-2000, 12:03 PM
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Re: Tapered shims

Interesting. I'm no alignment guy, but the caster doesn't seem to be too far off. Like I said I think it is supposed to be 3 degrees on 76-79 CJs, but double check that with your shop. I was monkeying around with this issue when I swapped in my D44s b/c they have zero degrees of caster. I had an alignment shop tell me a degree or so of difference in caster from tha factory from what it was supposed to be wasn't uncommon. Yours could be off some from the factory or maybe off from the slightly longer shackles, or a combo of both. My guess is that the combo of the two (slightly off caster and 3/8 shackles) is your culprit, just like you thought. I would think 1-2 degree caster shims should help you return to center easier. The shims should have a hole in 'em for the spring centering pin to go through to make sure everything stays in place. Just my thoughts, maybe someone else has some better advice.
Shain

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