Torque convertor balance questions

transman said

If the converter has the wrong balance, it can shake quite badly for sure. He bought the transmission from TCI. Did he get a converter with it, and if not, where did the converter come from? Engine: cast or steel crank, engine displacement, Transmission: 904/727, year of engine/year of transmission.
More information please.

Click to expand...

The engine is a blueprint 408 I think, the transmission was a new tci 727 unit that came with a tci convertor. I think it was this one Street Rodder™ Transmission Pkg: '67-'79 Torqueflite 727 (318, 340, 360) - TCI® Auto He was never asked for the way the engine was balanced when ordering, and I think he is using a weighted flex plate.

I know it isn't the tires, they are like a week old and the wheels are not bent. The vibration appears at 45-50 ish under acceleration and goes away when he lets off of the gas. Pinion angle has been suggested to him as well as taking the driveshaft loose at the axle and turning the driveshaft 180 degrees.