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Old 04-25-2006, 11:12 AM   #5
shifty
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Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
Re: correcting pinion angle after lowering rear

i lowered my '03 GMC Sierra and I had to use these little pinion shims from Sir Michael's. they were 2º of adjustment in the angle per kit, one shim per side. i think it was 2º specificallly for a 2/4 drop, but obviously the drivetrain is a little different between the two trucks.

the vibration you describe is something i hear about when people lower without adjusting pinion angle.
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