383camaroSS

iTrader: (5)

I Swaped My T56 To Th400 And When I Was Driving In On The Hwy It Started To Vibrate When Im Going Like At 60mph...but When I Let Go Of The Gas Pedal It Will Stop Vibrating??? I Have A Bmr Crossmember, Energy Trans Mount, Spohn Torque Arm....i Only Have I Bolt Holding The Tranny Down To The Cross Member...the Middle One..could That Be The Problem??? Should I Modify The Cross Member So Where All 3 Bolts Hold The Tranny Down?? Has Anyone Had This Problem Before??

cablebandit

iTrader: (37)

pinion angle is off. i think yours sounds like it needs to go down. it takes a bit to get it just right but you will. i ended up shimming my tranny up some into the tunnel to get a little less severe driveshaft angle.

Jimmy P

iTrader: (177)

It can be from the trans mount. Did you grind off that small hump on the top?
Like stated above, its very possible the pinion angle is off.
Did you use a differen't driveshaft during the swap? It may not be balanced properly.

chipz

driveshaft anyone