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Speedo gears

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Old 05-01-2015, 07:25 PM
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Car: 1985 iroc z
Engine: Crate 350
Transmission: T56
Axle/Gears: 3:24
Speedo gears

Hello, i was wondering if anyone would know what driven gear to get for a w/c b/w t5 im not sure of the drive gears tooth count but i know its red, rear gear ratio is 3:42 tires are 245/50r16 my speedometer is way off and just gets worse going faster it has the mechanical speedometer i have the yellow white-ish driven gear now
Old 05-01-2015, 08:49 PM
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Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: Speedo gears

You will have to change the red for a purple 7 tooth gear drive gear for 3.42's
You have the right driven gear to work with the purple.
The red is 9 teeth.
Old 05-01-2015, 09:09 PM
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Car: 1985 iroc z
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Axle/Gears: 3:24
Ok, is there any possibility of just changing out the driven gear?
Old 05-03-2015, 12:58 PM
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jmd
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Re: Speedo gears

Originally Posted by 19irocz85
my speedometer is way off
Originally Posted by 19irocz85
Ok, is there any possibility of just changing out the driven gear?
Sure, if you want to to be incorrect.

You need the 7 drive gear and it's kind of in between a 19 or 20 driven.
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