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Click on image for the lowdown. 
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| | | Forums66 Topics128,095 Posts1,056,067 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!
| | 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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | GMC and others have 3's stamped on frame, outside, starboard side, near front shackle mount, at least as early as '37. I think those GMC IDs/locations were discontinued after May 1949. Maybe someone has documentation about when they were used again? | | |
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