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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,118 Posts1,056,302 Members48,439 | | 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: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Best gear ratio is determined by the type of work and the tire size.
A general guideline would be the following
3.73:1 with 28 inch tires
4.11:1 with 31 inch tires
4.57:1 with 35 inch tires
These numbers can be tweaked for a bit for more economy or more work.
Run the numbers on a gear calculator to see what works best for you. I have had several different gear ratios and tire combinations on my truck. Less rpm at a given speed does not necessarily translate to better gas mileage. It often can translate to less than stellar performance with no mileage increase. My truck did great with 3.70 gears and 28 inch tires. When I changed the tires to a 31 inch tire, the 3.70 gears weren't enough. The truck just didn't have any guts. Milage increased from about 14 mpg to 14.5 mpg but performance decreased significantly. | | |
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