I have a 77 C-20 with a 496 big block and a GM 14 bolt axle...after 30 some odd years of abuse..then a big torque engine..the axle gave out...completely shattered the teeth in the housing...it was funny how that worked to..ended up turning the axle into a free posi unit! LOL! Took the axle cover off and a pile of metal was there...don't know how it happened...I didn't get the chance to hear a bang either! LOL! Hope ou get your problems fixed soon! I'd purchase a 6 lug Dana 60 rear axle and your trouble will be over forever.
