cashmoneylv

i got 97 fromula ws6 with a manual transmission recently put a used transmission in i got from the wrecking yard the first one i put in had a messed up reverse and i felt this vibrating at high rpms so i returned it and got another so i installed the new one and i got reverse now but still have the vibrations threw all gears what can be causing this drive shaft?
the tranny mount is new it almost makes it feel like the shift is rough also it does it during down shifts to .
should i get the drive shaft balanced could it be motor mounts ?

qwickLT1WS6

get an ls1 driveshaft. ur steel shaft is out of balance

96LT1355Z28

iTrader: (2)

Why did the orignal transmission need to be relpaced in the first place?

infinitebird

iTrader: (11)

Driveshaft symptom is a vibration at high speed not rpm. If it happens at high rpm regardless of speed/gear then it's probably not the driveshaft.

ale76051

iTrader: (2)

has your clutch been slipping? cuz i just replaced mine and its fine now.

djjab57

iTrader: (17)

I dont know if you changed mount from stock to prothane but when i did i wasnt used to it and i thought my car was going to shake apart. Now It Seems Normal