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| | | Forums66 Topics128,036 Posts1,055,450 Members48,422 | | 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
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Jul 2007 Posts: 33 New Guy | | New Guy Joined: Jul 2007 Posts: 33 | My 1954 has an 85/86 s10 t5 transmission (1352-145), and a 3.42 4wd s10 blazer rearend with 265/75/15 rear tires. My speedo is around 7mph off or so according to my GPS. What is the best way to determine the correct diven gear for my transmission? Thanks | | | | | Joined: Jan 2011 Posts: 90 New Guy | | New Guy Joined: Jan 2011 Posts: 90 | Is it 7 mph fast or slow, if its slow memory serves me right I went from 15 inch too 16 inch wheels on a Bedford CF Van and it read 6 mph slower than it really was . Mind you we where clocking it with my Triumph Bonneville Speedo and they are accurate as a sundial lol
1954 3600 With 1950's Powers of St Louis Utility Bed.
My truck | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | j54, Instead of comparing apples top oranges (your changes to someone else's changes), and hoping to find a different driven gear to go with your existing drive gear (if these are even available and/or if they might might work together), why no obtain an adapter and get an exact correction for you set-up? http://www.speedometershop.com/ratio.htmlI took 10 measurements on 10 1-mile stretches of interstate. The Speedometer Shop used those measurements to provide me with an adapter gives me less than a 1% error. | | |
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