I am lookin for two RPO codes from a 91-92 Z28 with a factory 3.42 rear end. I would like to find the two that start with a "D" then a nuber and another letter. I am fixing to intall a 3.42 rear end and would like to get the speedo right. Thanks

 

What size tires, what type of tranny, and we can tell you what gears (with GM part numbers) to get.

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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

 

I am running a 26 inch tall tire with a 700r4 tranny. I am wanting to go with 3.73's, but I'll take the closest speedo gear possible

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Official Recruiter for The Austin Third-Gen F-Body CC

 

You need:

15T Gray Drive Gear, 8642620
44T Dk Gray Driven Gear, 25513051

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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