Vibration after 2 inch rear drop? Help?

My 99' ECSB started vibrating from 20-25 mph after i installed DJM drop shackles. i know its the driveshaft, but how do i fix this problem? its getting realy annoying now.
thanks!

Correct the pinion angle. There are some good topics here.

^^+1^^

ok, gotcha

Quote:

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Originally Posted by Quik

anytime you alter a suspension from factory setting the pinion angle usualy goes postive alot or sometimes it goes way to neg if you go up in air. need to either get shims or new perches and set the angle correctly

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ill get me some shims, maybe that will help out a little