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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!
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| | | | Joined: Dec 2005 Posts: 1 New Guy | | New Guy Joined: Dec 2005 Posts: 1 | I have a line on a '38 cab and am wondering if it will drop onto a '41-'46 frame. Same mounts? I am entering uncharted waters with this project. Thanks in advance! Matt | | | | | Joined: May 2002 Posts: 155 Shop Shark | | Shop Shark Joined: May 2002 Posts: 155 | Get yer tape measure out, measure the cab mounts, measure yer frame mounts...if the frame is too wide won't work, but if cab is wider than frame, should work ok, even if ya have to build mounts...
Geoff
68 GMC 3800
56 JD420C w/JD90 Loader
| | | | | Joined: Apr 2006 Posts: 127 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2006 Posts: 127 | mdogg, I'm putting a 37 cab on a 40 chassis. I set the cab on the frame and mocked up the radiator support just to see. The front two cab mounts line up perfectly, the back two mounting holes are off by approx. 1 1/2". No problem, just drill four new holes. Apparantly the 37-38 cab is a little shorter, but it fits fine from the firewall forward including the rad. support. Iwould think the 41-46 frame would be the same. Jeff
Just because you have a few Craftsman tools, it dosen't mean your a craftsman.
| | | | | Joined: Feb 2001 Posts: 96 Shop Shark | | Shop Shark Joined: Feb 2001 Posts: 96 | The difference between the 39/40 frame and the 41/46 frame is the holes for the cab mounts. The cab is set back 1 1/2 inches on the 41/46 because of the extra bump out on the firewall. You will just have to drill the holes. I’m not sure about the total frame length. You will also need the front spring mounts to be completely correct, the springs and shackles are the same but the front mounts are different. The 41/46 nose extends out further and covers the bumper / shackle mount. They are just riveted in so it’s not a hard swap.
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