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Jul 21st, 2025 | | | | Joined: Jun 2012 Posts: 36 New Guy | | New Guy Joined: Jun 2012 Posts: 36 | so I have my tranny apart because the speedo was not working, the speedo gears are out now and in my hands they don't mesh?? the drive gear (gear on the shaft) is a worm/spiral gear and the driven gear (one that is threaded to the transmission that the speedo cable goes on) is a 12 tooth, the teeth on it are too big to mesh with the drive gear?? I am assuming that somewhere down the line someone has changed one or both of these gears, does anyone know what came original on these transmissions??? it is a 3 speed trans off of a 1951 chevy 3100 with a 216. gear ratio's are all original.
your help is appreciated!!!
Last edited by misfits; 06/05/2013 1:13 PM.
| | | | | Joined: Feb 2011 Posts: 1,329 'Bolter | | 'Bolter Joined: Feb 2011 Posts: 1,329 | You need a parts book or someone with one.
Kicking self for selling off my Taskforce trucks.
Still looking for an LCF or conventional big bolt in decent shape.
As of 10-26-2022, A 55.2 Taskforce long bed now the work begins
| | | | | Joined: Jan 2001 Posts: 5,320 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,320 | The parts book calls for gear set 3695417 6-18 teeth. Fits 1948-54 1/2 ton with 600-16 tires and 4.11 diff. I can help you out with gears if you can't find any. Parts book listingMaster list of gears
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Jun 2010 Posts: 1,001 Shop Shark | | Shop Shark Joined: Jun 2010 Posts: 1,001 | So, what speedo gear set/part number do I need after changing to Patrick's ring and pinion set (3:55). | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 |
You'd need a gear-set that matched your tire diameter and a 3.55 rear end (a 50-55 Powerglide - if those gears work in a manual transmission).
Identifying what set your need, and finding that set to purchase, will be challenging.
Maybe Dave has what you want/need?
I'd find any gear set that will fit your transmission.
Then do a calibration to determine the correction needed.
Then buy an an adapter.
(I have done this - the gear set cost about $50 and the adapter cost about $100 - several years ago).
| | | | | Joined: Jan 2001 Posts: 5,320 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,320 | I do as Tim suggested, I use a speedo correction adapter for 3.5 conversions.
See the USA in your vintage Chevrolet! My Blog | | |
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