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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: Sep 2011 Posts: 2,951 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 2,951 | I hear most folks with a 1964 1/2 ton say they have a 3.73 rear diff. Fourth gear has a 1:1 ratio and is no advantage over a 3 speed which is also 1:1. With a 235/75/15 tire (29" tall), your RPMs will be right at 2600 at 60 MPH with the 3.73 rear. They'll be 2800 at 65 MPH. Worse still if you go with a smaller tire diameter.
If you have a 3.42 rear then you'd be better off but still have higher RPMs than you'd like.
Some folks look for a 3.08 rear. | | |
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