I searched the archives and found a article pertaining to the color gears needed. One said to just change the red driven gear to the light blue gear. It would be w/in 2% accuracy. Which is fine for me. Can anyone back this up or second it? Thanks

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91 Firebird 305/TBI - cam:.420/.442 204/214 - Hooker 1 5/8" headers - TFX PaceSetter Cat-Back - 3.42's Auburn Pro Posi - ASCD Ram-Air hood - Polished Formula Wheels w/Futura's - Open element - .5" Corian TB spacer - Lakewood LCA's - Hotchkis Lowering Springs - KYB Struts/Shocks - 14.78 @ 97.5 mph(G-Tech) - MacEwen MotorSports Whiteface Overlays - 412ci sb waiting to go in this spring.
My Homepage

With a 245/50/16 tire and 700R4, you want:

15T Drive (8642620) Gray
41T Driven (25513048) Yellow

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1989 IROC-Z 5.7L

Yep, you can just use a lt. blue gear. But the gray/yellow combo is more accurate with the stock wheel/tire size. But if you change tire size, you can get an accurate reading with just the lt. blue. I think it was figured out that 245/60R15 or 255/50R16 tires would read right with the lt. blue gear.

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-Justin-
T-Top '86 5.0L LG4 700R4 WS6
T-Top '92 5.0L TBI 700R4
My '86 Firebird Homepage
The F-body Model Kit Pictoral Archive (updated 9/18/00)

There can be only one!!

[This message has been edited by Justins86bird (edited February 22, 2001).]