Back story. 30k old GM re-manned Non hd 4t65e with the spacer mod (shift improver) in the accumulator that just week ago got a nice hd diffy upgrade. Did a small warmup burnout tonight and suddenly a noise started.
Car runs and drives perfectly. No slip. No codes. Fluid is a half and half mix of 20k old fluid / filter and new fluid. Trans temp is within 10* of engine coolant temp. Drove 10 miles home with no issues. I can get on it and its 100% normal.
Car now makes a whining noise like a bad power steering pump only when it is in drive or reverse and not moving. Neutral and park are silent. As soon as your going 5mph its gone until you come to a stop again. The noise is definitely rpm tied and not speed tied.
Any ideas guys? From what I know about our cars and transmissions it could be the hydrolic pump, the pump shaft, or the torque converter because those are the only things that move when in gear and not driving. I checked the fluid level which was a quart low so I added fluid but it still does it. Also did a little reading and it could be that my old diff could have left metal in the filter and clogged it but I feel like that would effect my temps and ability to drive.
Any help appreciated.
