Hi All I've sadly had a bang in my TR4a and whilst it's off the road (needs new bonnet, valence, bumper and grill if anyone can help?), i'm thinking of putting the Overdrive gearbox i have into the car.  So now the questions: Can i just drop the gearbox in without changing Prop and Diff? Is the Propshaft the same (I have this also) I assume the Dif is a different set up ( i have this as well)? I can obviously buy the necessary solenoid, column switch, relays and wiring h