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Click on image for the lowdown. 
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| | | Forums66 Topics128,120 Posts1,056,321 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 2015 Posts: 2,063 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,063 | doing the math (unless I did something wrong) if your engine spins 2800 rpm @ 70 mph with 3.42 gears, changing the gears to 3.73 would mean 3053 rpm @ 70mph. Dave asked about 60 mph, 3053 rpm @ 70mph equates to 2617 rpm @ 60 mph. | | |
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