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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,152 Posts1,057,012 Members48,460 | | 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!
| | THANKS!
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: 2,203 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,203 | That sm420 has a 7 digit casting number. That means it's a later model; it has the neoprene front seal and you can still get syncro rings for it if you want to rebuild it. No backup light switch so it's not a '67. https://www.novak-adapt.com/knowledge/transmissions/manual/sm420/
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
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