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sounds like something is wore out or to much play in the steering box. adding caster might help, but its not a fix, its just putting so much weight on the fromt end it cant do nothing but go stright....

when i think of a shopping cart i would think it did what they do because it had 0 everything. how about a drag car o camber and a lot of caster, to make it go stright, not keep it from shimming....

i might be wrong but i took that to mean he had a front end shimmy going down the road at 50 mph going stright, after he changed tires and if that is correct i still stand behind the bal. if he is...

if it drove ok with the bias then it should drive better with the radials. sounds like some body messed up on the bal. id recheck the bal. :HMMM: