Ok, i know there are already a lot of threads in here about vibration, but mine is a little different.... my vibration only comes up when certain conditions are met.... it must be WOT, and above 1500 RPMs..... now listen to this, i had cracked my torque arm, and also snapped the mounting holes at the top of the torque arm, but they fixed it, so its all good, BUT! while doing that, they noticed a few other things wrong with my undercarriage.... one was that my front lower control arm bushings are bad, and so is my panhard bar..... or "track bar" whichever you prefer.... but the panhard bar is bent, pushing my rear end to the right a smidgion, could the alignment of the rear end cause WOT to vibrate? or am i looking at a more advanced issue? i was thinking torque converter, but the trannie only has 25k on it, and it has a shiftkit, so im assuming it already has a newer torque converter... recently i changed out the U-joints, but the problem was there before that (which is why i changed them to begin with...) so its not my u joints, its not my torque arm (or at least i dont think it would be after the repairs) so what could it be? would the panhard bar really kink my driveline alignment that bad?

 

How did they "fix" the broken torque arm? Did they check to make sure it wasn't bent? When they got it all back together, did they check the pinion angle? Sounds like that might possibly be contributing to the problem.

 

im not sure if the torque arm is bent, but to look at it, everything looks like the stamped original...no tweaks or crinkles.... the crack was small, and right on the bottom edge where the mounting bolts come up through the rear end....but i do know the guys who worked on it specialize in 4th gen camaros, and their specialty in camaros, are drivelines but he never took it on a real "test drive" to see the vibration i was telling him about, fact is, when they fixed the torque arm it ran a little smoother, all they did was grind the crack smooth, weld it, and weld 2 washers at the top 2 mounting holes... the rear end looked like it was properly aligned as far as up/down adjustment, but it does sit off to the passenger side a bit, from the bent track bar i was told... so im thinking maybe the driveshaft being tapered to the side a bit may be putting extra stress on the u joints... after all, when i get sideways, the car always pulls to the right so maybe at WOT the rear end goes TOO far to the right and creates a vibration? anyone else have an idea?