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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!
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| | | | Joined: Jul 2015 Posts: 64 'Bolter | | 'Bolter Joined: Jul 2015 Posts: 64 | After a day of Google and SB searches with no luck I'm stumped.I'm working with a 1953 SM420 Case #591665 open drive trans. It's a NOS but doesn't have the speedo assembly. I will assume the dealer would have made the call as to which gear combo would be best.
I have also scoured the oldcarmanualproject.com and found SM420 stuff but nothing with much reference to this.
I did find this for sale NOS but buying and trying is not my style. Any opinions are welcome.
Speedometer Drive Gear Unit Group No. 705
Part No. 608444 Stock No. G-85-35-96019 CHEVROLET
Composed of (1) 3660175 Drive gear / (1) 3660270 Gear fitting assembly
1951/54
Basketcase
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