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Click on image for the lowdown. 
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| | | Forums66 Topics128,049 Posts1,055,635 Members48,426 | | 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: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | Just do a search for "speedometer gear calculator" and several hits will come up. I used to use TCI but have since gone to gps speedometers where gear ratios and tire size have no bearing on getting a dead accurate speed reading. They are only about $60 so why mess with a caveman design.
Evan
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