I found this on a chevelle site. So I would guess I'm running the 17 tooth Red?
THM400 Speedometer Drive Gears
Part
Number Teeth Color Clip Price
8629547 15 Brown/Gray None $ 3.61
8623311 16 Orange None $14.34
8629548 17 Red None ***
8629549 18 Blue None ***
8629550 19 White/Yellow None ***
8629551 20 Green/Brown None ***
8623316 21 Black None ***
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