Did you lower the rear. If you did you probably need a c-notch and shorter shocks, basically you are bottomed out on the snubbers and shocks, so when you hit a bump it bucks instead of soaking it up. If you didn't lower it the spring rate could be too stiff, you can soften it up by removing one leaf at a time till you are satisfied. The draw back is if you have a hot motor you will get alot of wheel hop without a set of traction bars.
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