So I took the plunge and ordered everything from the A, glad I did. 4qt of Val. 75-140, 2qt of Pen synchromesh, 4qts of Val. ATF4.
So far I’ve changed out the front and rear diffs, the fluid was clear dark yellow and the drain plugs had some metal paste on them.
The synchromesh came out the same color with very little metal on the drain plug, MUCH thinner viscosity.
I ended up adding 1.5qt to each diff before it started running out. I was able to add just over 2qts to the transmission before if flowed out the side.
Time for a spin! IMMEDIATELY noticed a softer driveline with significantly less growling when taking off. I could tell there was more cushion in the diffs and less vibrations transferring though not as impressive as the noise.
What was drained? 25,000 miles on M1 75-140 and Pennzoil synchromesh installed 2008.
Future fluid changes include the T-case and power steering with Val. ATF4.