Alright, well lately my truck (86 Chevy 305 Auto) has been making a strange sound. It seems like the sound is coming from the rear end, its a whining that only occurs when i let off the gas. Suppose i have it in drive going 35 MPH and i let off the gas, it lets out a whine. I think it may be low fluid. I tried to put more in but the bolt on the differential is stripped. I tried to put the socket in there but it keeps slipping out. Is there anything else that might cause the sound? Is there a way i can get the bolt out? Is there a way to get fluid in there without taking out the bolt?? Thanks in advance.