NP435 Transmission
Mountain Pass
Joined: Nov 2024
Posts: 155
Likes: 34
I use this stuff. https://www.oreillyauto.com/detail/c...lon/oro0/80100 Its actual sae 50 transmission oil. I've run my truck in 10 degree weather and Its shifted great!
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Mountain Pass
Joined: Nov 2018
Posts: 184
Likes: 34
From: U.P. of Michigan
So, is this what you'd recommend for the NP435 Transmission & Rear End Fluid?
https://www.amsoil.com/p/amsoil-75w-...gear-lube-mtg/
Thanks.
https://www.amsoil.com/p/amsoil-75w-...gear-lube-mtg/
Thanks.
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Mountain Pass
Joined: Nov 2018
Posts: 184
Likes: 34
From: U.P. of Michigan
(I had numerous friends locally tell me this was the way to go, as well).
Mountain Pass
Joined: Nov 2024
Posts: 155
Likes: 34
435
If you use gear oil you won't be able to shift it.
Last edited by Yankee farmer; Jan 17, 2026 at 07:13 AM.
Fleet Mechanic
Joined: Aug 2007
Posts: 1,828
Likes: 253
From: Piney Woods of East Texas
They also call for GL4 which is low to no sulfur. Amsoil would flow with no problem since it's a full syn, it has a -56C pour point. Not very many oils have this low pour point. The lighter oil may flows better at cold temp. but the spec I find for syn 50w pour point is -42C. So it would be stiffer than the 75-90w.
Hotshot
Joined: Jul 2020
Posts: 10,456
Likes: 2,630
From: Near Salt Lake City
Quite sure that spec was superseded with GL 1, 2,3 and 4 since 1969 or '66
I would just use GL4 gear lube
GL5 the newest spec, I would NOT use
I would just use GL4 gear lube
GL5 the newest spec, I would NOT use
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They also call for GL4 which is low to no sulfur. Amsoil would flow with no problem since it's a full syn, it has a -56C pour point. Not very many oils have this low pour point. The lighter oil may flows better at cold temp. but the spec I find for syn 50w pour point is -42C. So it would be stiffer than the 75-90w.
With the wear and tear on my used NP435 even when cold it is a little harder to shift till the lube warms up some.
It really does not get that cold here, last few days high 20's at night, but I just kick the over drive in and let it spin the transmission while I put my seat belt on after backing out of the garage.
Dave ----
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Mountain Pass
Joined: Nov 2018
Posts: 184
Likes: 34
From: U.P. of Michigan
Thanks Everyone,
Yeah, I noticed as I was researching - the Red Line Brand comes up and says "Good For Ford '72 F250" - None of the others have that specified.
It's GL-4 Full Synthetic with Great Reviews.
https://www.oreillyauto.com/detail/c...d%2C+Synthetic
Yeah, I noticed as I was researching - the Red Line Brand comes up and says "Good For Ford '72 F250" - None of the others have that specified.
It's GL-4 Full Synthetic with Great Reviews.
https://www.oreillyauto.com/detail/c...d%2C+Synthetic
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