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Mod | | | Forums66 Topics128,042 Posts1,055,595 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jun 2011 Posts: 63 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 63 | Got the 3 speed tranny out of the shop a few days ago and I am fixing to install it this weekend.
Guys, I was wondering what kind of oil should I use for the tranny?
It's a half ton 1953 Chevrolet truck with an enclosed driveshaft.
Is SAE 140 too heavy? Should I use SAE 80W-90?
While I am at it, what about the gear oil for the rear end? Same as the tranny?
Thanks in advance. | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | I use 50W full synthetic transmission oil in my jalopies as well as my 18 wheelers and 80w140 full synthetic in all my vehicles rears. The original specs were 90w mineral oil in the transmission and 90w hypoid in the rear in the winter and 140 hypoid in the summer. I put in synthetic and forget about it. | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | I found that replacing the 80W90 in my four speed with 80W140 helped the sychros work a little faster. | | | | | Joined: Jun 2011 Posts: 63 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 63 | Thanks, guys.
I'll try 80W140. | | |
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