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Addicted to Gear Oil
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Your build thread link goes to a 3 year old chit chat post?

Bad pinion angle will break U joints, a bad caster angle will make it drive like shit and wander, etc.

Best option is set your optimum pinion angle then check caster. You will probably need grind the welds, and knock the C's with a BFH to rotate the top of the knuckles back to correct the caster angle. (4-6*). Then weld them back up.

If you have hydro steering and it's off road only you *might* get away with having shitty caster, but setting the caster properly will help with return to center and keep the rig tracking straight.

Search for words like "caster" "knuckle" there's a bunch of threads many with good pictures etc.
 
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