Inside the hollow torque ball {bell}is the universal joint of the driveshaft that allows relative motion between the two ends of the driveshaft. The 'bell' requires clearance via gasket/shim. On the '49 3600 tube, I had a composition 1/16 gasket made that allowed compression for the desired specs. GM refers that a set of 'shims' are offered for that clearance. Check the angle of the shaft from tran / rearend.
Friction will cause heat, I would call warm as normal. The bell needs clearance.
