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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: Jul 2010 Posts: 27 'Bolter | | 'Bolter Joined: Jul 2010 Posts: 27 | question? i have a 1940 GMC 1&1/2 ton and i'm wanting a higher ratio rear end.is there a newer model rear end that will bolt up to original rims. | | | | | Joined: Dec 2010 Posts: 64 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2010 Posts: 64 | You'll need to go to open driveline if it's like a chevy. What is the tooth count for your rear end ring and pinion ? There were two ratios. What size tires are you running and how fast are you looking to go ? Check out the Gallery, go to Lou MacMillans '37 1 1/2 ton, scroll to his tech tips, scroll to '37 trux page. Nice chart of gear ratios, tires, engine speed, and MPH, plus more. | | | | | Joined: Jul 2010 Posts: 27 'Bolter | | 'Bolter Joined: Jul 2010 Posts: 27 | i'm not sure but i think it's the same as chevy.what i have is a open drive shaft with at least 6 to 1 ratio with 2 speed axel with original 20" rims.motor has been changed to 5.9 cummins with 5 speed trans.i'm going to use it to pull my 42 1/2 ton .65 is plenty fast .kinda looking change it out to 3.54. | | | | | Joined: Dec 2010 Posts: 64 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2010 Posts: 64 | Try jumping over to the "crashbox" forum. Some of those guys really know their stuff about what will change out for what. 65 MPH is faster than I would want to push that truck without a bunch of upgrades. At least the front end and brakes want to be in first class condition. What I know about the 2 speed rears is that they are slow 6:1 and slower. I think the stock "faster" single speed rear is 5.2:1. Then there's more modern wheels and radials too. | | | | | Joined: Apr 2005 Posts: 1,107 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 1,107 | if you have the timkin rear then a rear swap is in order not just a ring and pinion. | | |
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