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Old 05-22-2002, 05:30 PM   #1
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85 IROC rear end gear
No rpo sheet. Can anyone tell me what gears came in this car. It is an automatic with tpi. Thank you.
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Old 05-22-2002, 07:10 PM   #2
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3.23 or 3.42 with G92 option
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Old 05-22-2002, 07:48 PM   #3
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Look on your axle tube, passenger side. There is a code there, that will tell you for sure.

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Old 05-23-2002, 07:43 AM   #4
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You could have the 3.42 gear without having RPO G92. Here's the spid from my old '85 IROC that shows GU6 but not G92.
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Old 05-23-2002, 08:45 AM   #5
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Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's

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My 85 IROC has 3.23s. I believe I read in one of the tech/info articles on this site that 3.23s were standard.

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Old 05-23-2002, 08:45 AM
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Reload this Page 85 IROC rear end gear
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