what do you think about putting the rear wheels up on jack stands and start the truck and leave it in gear to try to isolate the noise with a mechanics stethoscope on the rear end ??????
I really am not looking forward to opening up the rear end with a torque tube driveshaft if I dont have to.

1953 chevy 1/2 ton with 3 speed 318 on floor and 1955 235 engine