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. I've called around about putting it on a dyno to check it out under load but no one wants to touch it b/c of safety issues! I'm at my wits end here! 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

 

i got major vabage, At idle too, what the monkeys

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91 FireBird 305 V-8
no true mods,
ghetto rigged cold air intake,
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