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Old 02-25-2008, 07:34 PM   #1
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Join Date: Oct 2007
Location: Houston, TX
Posts: 36
Car: 89 IROC 5.7
Engine: 357
Transmission: T-56
Axle/Gears: 3.73

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3.08 to 3.73 drive/driven gears
Ok, so ive been over the net a few times and not a whole lot can compensate for the different tire size and the gear swap... so im looking for the drive/driven gears....

Original:
215/65-R15
3.08 gears

Now:
245/50-R16
3.73 Gears

Thanks in advance guys!
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Old 02-25-2008, 09:38 PM   #2
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Join Date: Dec 2005
Location: NY
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Car: 85 Z28, 88IROC, 91Z28 + parts cars
Engine: 305, 355, 408soon
Transmission: stock T56 in 88 and 85 built in 91
Axle/Gears: 3.42 LS1, 9" w/ 4.56 and spool

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Re: 3.08 to 3.73 drive/driven gears
are you looking to correct the speedometer for the new tires and gearing change? If so theres a company called the gear box that I went through to get an adapter to adjust mine.
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Old 02-26-2008, 01:19 AM   #3
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Location: Houston, TX
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Car: 89 IROC 5.7
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Transmission: T-56
Axle/Gears: 3.73

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Re: 3.08 to 3.73 drive/driven gears
Yes I am looking for both, could you provide a link to this company?

Also, does anyone know if the 7/21 drive/driven gears would be close...

right now I have a 9 tooth gear.
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Old 02-26-2008, 06:42 AM   #4
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Location: Lawrence, KS
Posts: 16,244
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
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Re: 3.08 to 3.73 drive/driven gears
You may find some helpful info in the sticky at the top of the page (including how to swap out the drive gear).

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Old 02-26-2008, 06:42 AM
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