Quote:
Originally Posted by hotdog hound
... I lowered the back of truck 4 inches with lowering springs and the front 2 1/2 inches with drop spindles I got no noticeable vibration all year to suggest a out of balance drive shaft(s).....
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This sounds like a classic issue of the driveline not being properly set up. That the angles changed after the drop and have not been corrected. Have you checked them after dropping it?