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| | | Forums66 Topics128,042 Posts1,055,509 Members48,424 | | 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 2006 Posts: 1,154 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,154 | SM420 transmission 1:1 final with 3:38.1 ring pinion 27" dia. Tires 1954 3100 PU. At 35mph on speedometer actual speed 40 mph about 5/6 mph difference. We need a ratio adapter for the transmission any suggestions or model numbers. Don't want to fool around with the speedometer itself a ratio adapter would be an easy fix and easy to remove.
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