Cheers for the advice guys. I am going to get a built powrglide with transbrake from protrans I think. Definately 9" diff, I would like to try full locker no lsd. Mini spool sounds pretty great too though. I want to chase 1000hp at the wheels so definately custom tailshaft probably billet. But I want to see how much a carbon tailshaft could handle also. I want to have the whole driveline built to handle my goal of 1000hp before I get to the motor.