Which oils to use?
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Senior User
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Which oils to use?
What oils should I use in the axles and t-case on a 1962 F250? The axles and t-case are so old that I cannot identify them (I can tell you that the t-case is NOT an NP205). Would any quality 80W-90 gear oil be a good bet? I'd like to lube the transmission, too, but it's not a stock tranny (it's an unsynchronized 5 speed out of a Diamond Rio semi tractor). Any advice would be much appreciated!
Posting Guru
Joined: Nov 2004
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From: sunny fla sometimes windy
The rears would be good with any gl 80-90, The trans I would stick a piece of paper
in the fill hole and see what color comes out on the paper, Some of those old trans
even ran a atf or hydraulic type oil, Could also be a straight weight 30w or 40w. If it
is a oil type at it's age a 80 or 75-140 synthetic would probably work in it good.
in the fill hole and see what color comes out on the paper, Some of those old trans
even ran a atf or hydraulic type oil, Could also be a straight weight 30w or 40w. If it
is a oil type at it's age a 80 or 75-140 synthetic would probably work in it good.
Junior User
Joined: Mar 2004
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An old Diamond Rio truck transmission more than likely had 90wt in it.Some trucks used some oil they called 90wt mineral oil. I never understood the difference in the two oils, but they allways said not to mix the two. This is back in the 60 & 70s so both 90wt oils where dino based oils.
Post Fiend
Joined: Jun 2001
Posts: 5,228
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From: Running Springs CA
If the tranny is non-syncro, not to worry. Get any brand of GL-5/MT-1 80W-90 and it will be fine, especially in Florida. SAE 90 gear oil is very close to SAE 40 motor oil in viscosity.
Jim
Jim
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