What would the correct #'s be for the two gears that drive the speedo for my application? Someone already gave me two #'s, but one gear is right, and the other is not. the one that goes on the output shaft was right(15 tooth), but the other one was not like the original, and the shaft wouldn't slide into the hole like the original gear. The part #'s someone gave me were: 8642620 for the 15 tooth(correct), and 9775187 for the 45 tooth(incorrect). That is the correct combo for the gear I have, but the 45 tooth doesn't fit...does anyone have a different part #?

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1989 Camaro IROC-Z
TPI ZZ4
Superram intake
Crane AFPR
Hooker Competition Headers
March Power and Amp pulleys
Moser 9" rearend with 3.70 gears and Detroit Locker differential
Spohn LCA's and Swaybar adapters

 

That 45 driven gear should fit on your cable driven 700R4. Are you sure you have the correct shaft? Sometimes, when doing a big change such as 2.77 to 3.70, you need to also change the original shaft.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System