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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: Feb 2004 Posts: 11 New Guy | | New Guy Joined: Feb 2004 Posts: 11 | I have a 1949 3100 that I put in a 283 with a TH400 running a 373 rear end out of a 56 Chev. I have the stock tire size that was stock but I changed it to 15" 15-670. I am looking for some help on figuring out what speedometer gear is the right one to use. Or even one that will get me close. | | | | | Joined: Jun 2016 Posts: 236 DLBrooks | | DLBrooks Joined: Jun 2016 Posts: 236 | If tires are 27.5 inches tall with a 3.73 rear gear then if drive gear is Pink 7 teeth then use a 19 tooth driven gear truck code J. If drive gear is black 8 teeth then use a 21 tooth driven gear truck code L.
What color is your present drive gear? On your driven gear housing it should say what driven gear teeth can be used. | | | | | Joined: Feb 2004 Posts: 11 New Guy | | New Guy Joined: Feb 2004 Posts: 11 | Not sure I will take a look tomorrow.
Thanks for the Info.
I will post tomorrow afternoon. | | |
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