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Click on image for the lowdown. 
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| | | Forums66 Topics128,087 Posts1,056,338 Members48,442 | | 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: Aug 2006 Posts: 112 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2006 Posts: 112 | Is a GMC 4x4 long wide a K15? I hear the shortbed is a K10, is the 3/4 ton shortbed a K20? Does that make the 3/4 ton long bed a K25?
64 & 66 GMC long fleetside 4x4 Cartwright, OK
| | | | | Joined: Jul 2005 Posts: 46 Member | | Member Joined: Jul 2005 Posts: 46 | i have always been told that the 1/2 ton 4x4 chevys are the k-10 the 3/4 ton 4x4 chevys are the k-20, the gmc 4x4 1/2 tons are the k-15, and the 3/4 ton 4x4 gmc is the k-25. im not real positive but i think that is how it goes
63 4X4 GMC Suburban FOR SALE 1951 chevy sedan delivery !FOR SALE!
| | | | | Joined: Mar 2003 Posts: 181 Shop Shark | | Shop Shark Joined: Mar 2003 Posts: 181 | Matt is right- Chevy was 10, 20 and 30 while GMC was 15, 25, and 35. Nothing in the series number dictates chassis length. The VIN will state that. | | | | | Joined: Aug 2006 Posts: 112 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2006 Posts: 112 | Hmm, since I have a GMC, I might have a bit of a superiority complex since it is a higher number, seriously, my dad had a 64 Chevy short narrow 4x4 when I was a kid, as close as I could get was my GMC Long Fleetside 4x4. I love these old trucks. Having a good time with it, thanks for the info guys, if I hadn't fallen In love with the big v6 I would definately have a 292.
64 & 66 GMC long fleetside 4x4 Cartwright, OK
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