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Click on image for the lowdown. 
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| | | Forums66 Topics128,139 Posts1,056,446 Members48,441 | | 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: Nov 2021 Posts: 1,383 'Bolter | | 'Bolter Joined: Nov 2021 Posts: 1,383 | The frames are significantly different behind the cab. The 3600 frame is basically straight back whereas the 3100 frame flares wider as it goes back. It makes a big difference if you are looking to mount a fuel tank between the frame rails behind the rear axle. | | |
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