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I serviced it to TM specs and it "self-adjusted" after that.

@7bdiver I filled my tranny with 40w to spec, as per TM. All was fine until I ran it on the highway at speed for two hours. It was puking oil, rust-proofing half of the truck. I did not think tranny fluid; I thought major engine oil leak at first. But engine was dry. Well...dry-ish..you know...

Olden day horse traders turned car salesmen used to pour sawdust and wood chips into worn transmissions to stop the chatter and make them feel "tight" again. I'd really have trust issues with THAT. Sent from my SM-G950W using Tapatalk

I have seen 85W140 recommended for the axles to reduce the likelihood of leaks. I am not sure it would be great in the Spicer transmission when the temperatures dip. The manufacturer of said transmission recommended 30 or 40 weight engine oil which translates well to 80/90 gear oil. I do not...

I ran 80/90 gear oil in my transmission. That worked fine and I agree with other posters that in a warmer climate it is probably all you need. Where I am, even the margins of the winter (spring and fall) are cold enough to make initial shifting a very stiff affair. After my OD mod I now run 40w...