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Mod | | | Forums66 Topics128,049 Posts1,055,637 Members48,426 | | 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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| | | | Joined: Dec 2003 Posts: 11 Junior Member | | Junior Member Joined: Dec 2003 Posts: 11 | I have a "46" PU with a later 235 and possibly a later four speed transmission as well. I have lost the gear that threads on to the side of the transmission that drives the speedometer cable.
I want to know what I should be looking for in a replacement. Will gears from a three-speed fit on my four-speed? Are there differences between different years? How do I tell what year my transmission is?
ALSO: there is a grease zerk on the top of the transmission. What for? Am I supposed to fill the trans. with grease? | | | | | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | If your tranny does npt have the reverse lever, it's not original.
Fred
52 3600
69 C-10
| | | | | Joined: Jan 2002 Posts: 2,839 'Bolter | | 'Bolter Joined: Jan 2002 Posts: 2,839 | Does your tranny have a granny gear(sm420)? I can send you a pic of a SM-420 speedo gear if you'd like. Zerk fitting? Can't imagine why? Would be interested in seeing a pic of this?
There should be casted numbers on the side and stamped numbers on the back if it's a SM420 to help you determine what year your tranny is.
Craig My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear My truck ....... Respect The Rust If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.
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