I tried ATF and then Passion Lube in mine. Never did work right. Would grind going into the gears all the time with those two different lubes.

I put 85-140 in there and it works good. I was told my box wss junk on here before the 85-140 went in.

It certainly isn't cherry but it works good and hasn't had to be torn down yet. Had 102K on it when IO began this exercise and now has close to 108K after this summer with the heavy stuff.