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Mod | | | Forums66 Topics128,050 Posts1,055,643 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!
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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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