When I lifted my Silvy, I didn't pay attention and put the rear blocks in backwards (high side supposed to be towards the front) and had a bad vibration on acceleration.
I would try the u joints first. They arent expensive and if it doesnt fix it you have new u joints in it anyways.
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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