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Mod | | | Forums66 Topics128,077 Posts1,056,033 Members48,433 | | 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
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Jul 2000 Posts: 2,192 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,192 | To be clear, you have 2 transmissions and they both keep popping out of second gear. So, you would like to rebuild one of them and you need parts. Novak has rebuild kits. See this link: https://www.novak-adapt.com/catalog/transmission/transmission-parts/sm420-parts/My SM420 pops out of second when under deceleration. Plus, I can only shift into second from third while moving very slowly. Maybe it's a common problem with these units.
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
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