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Click on image for the lowdown. 
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| | | Forums66 Topics128,038 Posts1,055,583 Members48,426 | | 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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Yes, it would be interesting to see a photo of an original SM420 backup switch? Novak Transmissions website: "The last year of the SM420 (1967 [maybe 66 & 67]) had a backup light switch installed in the top cover to meet that year's federal mandates." Novak installs a switch on their transmission rebuilds but it does not look like they sell a kit for others to install. Maybe they install a conversion as described below. Old Stovebolt.com thread on adding a back-up lights switch. Here's another conversion. | | |
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