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| | | Forums66 Topics128,066 Posts1,055,871 Members48,428 | | 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: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | If you look at the note at the bottom of the picture it says, "What NOT to use In your SM420". Ken uses it in his newer transmissions so I thought I'd try a synthetic when I rebuilt it last fall. The syncros didn't have enough grab with the synthetic oil and it would clash the gears going into forth every time. Switched back to the old standard 85w-140 Mystic and all is well now.
Denny G
Denny G
Sandwich, IL
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