shifter vibrating in upper rpm's

For some reason when im driving fast and my car hits the upper rpm's i start getting this vibrating noise coming from my shifter...i still have the stock auto shifter. and although i have a new tranny in there it was still doing it before but now its worse...any suggestions?

did you change the tranny mount with the new trans?

ya its a poly too...could that be why

polys are stiffer and therefore cause more vibrations. I m trying to think, mine might rattle but idk

Are you sure the drive shaft weight is there?

ya it was there when i put it up there...ill get under there again and check...i got to get under there anyways to adjust my torque arm

ok, but you need to spot match the location, kinda like balancing a tire. So, when yuo remove a drive shaft, you need to mark the yoke ends and the out put shaft and diff so your still in balance when you put it all back together.

so how do i do it now that i took it off and put it back on without marking it...

aluminum ones dont have those little weight on them do they? You could just pick up one of those... I dont know where you could go to have your driveshaft balanced

you could always spring for a new one while your at it... get a nice aluminum driveshaft from FormulaLT1 for cheap...

i want one, where has he been?

i want one, where has he been?
probably strokin the shaft lol

i already have an aluminum driveshaft that is balanced...it came strait off a 01 ss

and thats the one thats on your car right now?

ya...

if the weight is on but not on the right side all one would have to do is unbolt it from the rear, rotate it 180 degrees and bolt it back up

but aluminum ones dont have weights on em AFAIK

mine does....it has two??