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Click on image for the lowdown. 
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| | | Forums66 Topics128,198 Posts1,057,272 Members48,466 | | 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: 2,204 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,204 | They stopped making the sm420 in 1967. How did you determine 1971?
The 1967 SM420 was the only year with the backup light switch. (that can be seen in your photo)
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
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