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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,206 Posts1,057,433 Members48,471 | | 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: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | This site will let you figure it out. http://www.drivetraindirect.com/t_gear_calculator.htm Just enter your tire outside diameter (measure with a tape measure), and your rear axle ratio. Then decide what is a safe max continuous engine rpm for driving, I would recommend keeping it at about 2,500 or less for your engine. 3,000 is defiantly too fast if you want your engine to last a while. Grigg | | |
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