CAN THE PINION ANGLE CHANGE ?

100 % sure I will measure pinion angle.
This is the driveshaft You had re-balanced recently? With the rear end up high, the B&T angles more and takes up more room in the housing, that restricts the already
minimal amount of travel available from that joint. The length on that shaft's gotta be almost spot-on to come up roses............................
P.S. IIRC Mine has 1.25" of plunge total, and that's w/-0- deg angle.................