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| | | Forums66 Topics128,038 Posts1,055,471 Members48,424 | | 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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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jul 2014 Posts: 892 'Bolter | | 'Bolter Joined: Jul 2014 Posts: 892 | SAE90 EP GL4 is what I used in my 4-speed SM420 for decades. The synchros were slow but didn't clash. When I switched to Mineral oil as I've said then they began clashing when hot on my recent trip to AZ. I'll go back to the GL4 soon but it's way too cold here for a good test right now, -14 last night. I'll wait for spring.
1951 3800 1-ton"Earning its keep from the get-go"In the DITY Gallery1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971. | | |
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