I'm still experiencing major vibs at speeds of 60mph & up. I've replace all u-joints and have tried 2 driveshafts...1 steel & stock 1LE aluminum. It's still there. Pinion bearing feels tight too. The vib feels like a bad u-joint but obviously isn't. An obvious question would be tire balancing but I had them rebalanced and it's still there. I've also jacked up the car and put it in gear looking for obvious wobbling of the tires from a bent axle and checked the rear alignment and everything looks good. Next step is to put it on a dyno which will be pricey! Any ideas, suggestions, or similar experiences?


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'91 Z28 1LE; 355, Sportsman II heads, Edelbrock TPI w/ 58mm TB, Tremec TKO 5-speed, 3.73's & much, much more

 

ed,
Ive had the same problem with mine since i bought it 12 years ago.
Ive replaced;
driveshaft,both half shafts,new wheels and tires,trans mount,trailing arms,panhard rod,
new Baer brake kit front and rear,strut brace,crown wheel and pinion and axle bearings,all shock absorbers,springs,steering idler and steering joint and ifs that not enough,new engine,transmission and convertor and guess what?Still vibrates the same as always
good luck
powermite