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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Feb 2020 Posts: 20 Grease Junkie | | Grease Junkie Joined: Feb 2020 Posts: 20 | I'll reply to my original post here. I asked if I could just plug in a 12 tooth driven gear to replace the original 13 tooth gear without also replacing the drive gear. I tried it and the answer is "NO". If you need to change the speedometer gears to match a change in differential ratio or tire size you must change the speedometer gears as a set. so, anybody out there know where I can get a GM 3689223 gear set?
1949 3600 w/ 57 235
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