Speedometer driven gear

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Charlie

Mopar by Birth. Chevy by Choice.
Joined
Aug 2, 2017
Posts
1,837
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910
Location
Euless, Texas
First Name
Don
Truck Year
1974
Truck Model
Cheyenne 10 LWB
Engine Size
350/TH350/AC/4 BBL Quadrajet
When I got my truck in 2015, speedo was bouncing around. Figured out the driven gear was bad. Replaced with a black 23 tooth gear, which was what was in it, and it worked correctly with the 15" tires/wheels. Since then, I have put 17" tires/wheels on it and I knew speedo was off. I have been allowing for the difference. I am now wanting to get the correct gear for the tire/wheel size change. I have seen a chart somewhere, and I can't remember where, that showed tire size and correct gear for the change. Does anyone have this chart or reference location of chart?

It also has the ratio adapter.
 
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