Axle shims - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-14-2000, 10:57 PM
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Axle shims

I have a '75 Scout II, and I've been able to correct most of my suspension problems over the years. It's an XLC package, so I beleive it has the heavy springs. I stll have quite a caster problem, charcterized by wandering within the lane I'm driving in. I bought a set of 4 degree shims, and I'm seeking some reassurance that they will do the trick. Also, my truck's front end sits a little bit lower than the rear, and I'm concerned the shims may have a lowering effect on the front end. Any ideas? I'm thinking maybe longer shackles may compensate. Also, I have heard of caster correctors, which apparently are installed with the ball joints. Has anyone tried these with success?

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post #2 of (permalink) Old 03-15-2000, 11:11 AM
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Re: Axle shims

> I stll have quite a caster problem, charcterized by wandering within the lane I'm driving in. I bought a set of 4 degree shims, and I'm
>seeking some reassurance that they will do the trick. Also, my truck's front end sits a little bit lower than the rear, and I'm concerned
>the shims may have a lowering effect on the front end. Any ideas?
Not sure how to reassure you, other than to say that yes, they will add caster (remember, to add caster, you want to install
them so that they lower the pumpkin - thick part to the front for spring under). If you install them, and they don't fix your
problem then you've got something other than caster going on. The shims will lower the front (again, assuming spring under), but
only by about 1/8" or 3/16" - the shims aren't very thick in the middle.

>I'm thinking maybe longer shackles may compensate. Also, I have heard of caster correctors, which
> apparently are installed with the ball joints. Has anyone tried these with success?
Haven't tried them, but I've seen them - they should work, though I think they're only good for a few
degrees. They should actually be better than the shims, since they don't make your pumpkin point
down.

Later,
Curt

post #3 of (permalink) Old 04-17-2000, 04:26 PM
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Re: Axle shims

Hi. I have gone though all of this with my Traveller. First thing, yes you are on the right track. Second, 4 deg. is just about right. and third the longer shackles will Decrease the amount of castor. To increase the castor you need to rotate the axle so the U-joint is lower.
The other things to look for are, worn spring bushings, cracked shackle mounts, and cracks on the frame around the steering gear box bolts. After fixing all of this on my truck it tracked strait and true.
Good Luck.
James

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