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Click on image for the lowdown. 
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| | | Forums66 Topics128,023 Posts1,055,370 Members48,420 | | 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!
| | THANKS!
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: Jun 2005 Posts: 1,001 'Bolter | | 'Bolter Joined: Jun 2005 Posts: 1,001 | Ironically enough, it's called a speedometer gear.
Don't know what transmission you have, but here's is one on ebay:
https://www.ebay.com/itm/1955-56-1957-58-60-CHEVY-SPEEDOMETER-GEAR-in-Transmission-21Teeth-Red-With-SEAL/131645584848?fits=Year%3A1956%7CMake%3AChevrolet&hash=item1ea6b035d0:g:sTAAAOSwl9BWL3qg
They are color coded based on the number of teeth you need.
Good luck!
~ Victor 1941 3/4-Ton Pickup (in process). Read about it in the DITY Gallery1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD 1957 3100 - moved on 1959 C4500 Short Bus "Magic Bus" - moved on 1959 G3800 1 Ton Dually "Chief" - moved on 1958 C4400 Viking "Thor" ~ moved on to fellow Bolter | | |
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