Professor: that’s about the same conclusion I came to when considering using ATF in any of my manual transmissionsThe Professor wrote: ↑Mon Nov 29, 2021 3:10 pm If you're going to run ATF, I'd suggest supplementing it with a thicker gear oil.
I finally got around to wrenching on the new to me 1983 DLX this weekend. Here’s the transmission plug. Very dark and oxidized I’d say that’s never been changed in its lifetime. A decent bit of magnetic fuzz and pretty noticeable glitter of brass flake in the oil pan, but nothing abnormally so if it was never changed. The transmission was about 1 quart low, which is not too bad considering. This is the blend I refilled it with:
2.5 quarts STP 80W 90 GL-5 Conventional
0.5 quarts STP 75W 140 GL-5 Conventional
1.0 quart AMS Oil Synthetic OE ATF Fluid
Drives and shifts good the same as it did before. Pretty amazing it drove so well on how old the fluid looked.
Rear differential was similar old fluid. Refilled with 0.5 quarts of STP 75W 140 GL-5 Conventional
And
0.5 quarts Pennzoil 80w 90 GL-5 Conventional I had laying around along with a squeezy bottle of the Liqui Moly MOS2 for Gears
I think I’ll run all that for a while to get things warmed up and cleaned out. See where I go from there. I’ll keep the thread updated.