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Click on image for the lowdown. 
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| | | Forums66 Topics128,160 Posts1,057,051 Members48,463 | | 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 2000 Posts: 2,204 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,204 | I found the worst part of the job was the remove and reinstall part - the SM420 is heavy with a round bottom. Since it's out rebuild it using one of the kits. Search for bk108 sm420 and you should find: https://www.transmissionpartsdistri...7-gm-4-speed-with-10-5-case-1-pto-bk108/
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
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