Where can I get the drive and driven gears to recalibrate the speedo? I installed a Moser 9" with 3.70's and originally had 2.77...does anyone know the tooth combo's for recalibration or where to get them...I called Lingenfelter about it, and they halted making the gears for a while, saying they are too time consuming to make; that they have to make one by hand and give you the GM other gear...that was his explanation for being so expensive($130).

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1989 Chevrolet IROC-Z28 TPI ZZ4 with TH700R4 and 2.77:1 rearend gears:
-Gutted Air Boxes, Throttlebody coolant bypass, Hypertech Air Foil, Accell Superram Base Intake, Crane AFPR, AC delete, Smop pump delete, Hooker 1 5/8 Headers, Holley Ignition Module, Hypertech Custom PROM, B&M Megashifter...I know there is more, I just can't think of it right now!

 

Assuming 245/50/16 tires,

you need:

15T Drive (8642620)
45T Driven (9775187)

You can get them from the dealer.

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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