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Discussion Starter · #1 ·
Al and I have talked about this. I have agreed to attempt to put together a "chart" of various combinations of speedometer gear ratios based upon color coding/teeth count. I need you to E-Mail me what you know. Specifically: 1) what transmission are these out of (C4 Torqueflite, etc will not be accepted--I need to know TH350/TH400/Powerglide/BW/Muncie M21/M22/etc.
2) what color is the gear
3) how many teeth on the pinion
4) how many "leads" on the worm (look at the end of the worm and count how many times the teeth start
5) What is the GM part number if you know it--most gears can be bought by color/tranny style alone.

E-Mail this to me (no promises--I will try my best to sort this out) [email protected]

PS--if anyone has reducers/increasers attached to the pinion gear housing they will be stamped with a ratio. While these are very expensive to but from GM maybe we can get a listing of available ratios.
 
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