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Click on image for the lowdown. 
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| | | Forums66 Topics128,014 Posts1,055,333 Members48,419 | | 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: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | You don't have an SM420, that's an earlier trans with a reverse lockout. I think an early AD truck could have had that before the SM420 came out, so could it be the original transmission for the truck?? Grigg | | |
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