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Click on image for the lowdown. 
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| | | Forums66 Topics128,026 Posts1,055,410 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
with Ads!  Again, thanks!
| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Depending on tire size and axle ratios several speedo gear ratios were used on SM420s.
The parts book shows 4 tooth drive and 12 tooth driven for 1948-54 with 4.11 diff.
Last edited by Pre '68 Dave; 02/16/2016 11:32 PM.
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