strange rear end knocking on 1995 chevy k1500
 

hey everybody, I wanted to ask for help with my daily driver,


its a 1995 k1500 z71 with the 350 and 4l60e


my problem is there is a very strange noise coming from the rear when driving, mostly when the gas pedal is feathered or up to speeds of 45 plus or when braking.


so far I have replaced:


the rear aluminum drive shaft ( the old one sort of bulged out and cracked all over)


new u joints on the rear shaft and I will be replacing the two on the front ( I removed the front shaft and the noise remained)


I topped off the fluids in the rear end and transfer case, the rear end took a quart and a half where as the transfer case only took about 3/4 of a quart


I am pretty sure that the rear end is still good it still has good response and in slower speeds its quiet until I feather the gas.


any ideas or suggestions? :confused:

Is it a constant singing noise during mid to heavy acceleration?