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86 IROC-Z Auto w/ 3.23?

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Old Aug 18, 2019 | 10:26 PM
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Morder.'s Avatar
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From: Columbia City, OR
Car: 20 M550i xDrive
Engine: LB9 305 TPI
Transmission: Auto
Axle/Gears: 3.23
86 IROC-Z Auto w/ 3.23?

Everything I read says this should not be an option, but here's the RPO code list (note the "GU5" and "MD8").



I do not own this car (yet) but I'm just trying to get a better understanding of what I'm looking at. On paper, does this 86 auto have 3.23 gears?
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Old Aug 19, 2019 | 12:00 AM
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: 86 IROC-Z Auto w/ 3.23?

Virtually every SPID I've seen for an '86 IROC with LB9 has had GU5, 3.23.
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Old Aug 19, 2019 | 12:14 AM
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Re: 86 IROC-Z Auto w/ 3.23?

Originally Posted by chazman
Virtually every SPID I've seen for an '86 IROC with LB9 has had GU5, 3.23.
correct , every 86 tpi iroc that i have owned and seen had 3.23 gears and this was does to .. most had g80 posi also and this one doesnt ..
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Old Aug 19, 2019 | 01:13 PM
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Morder.'s Avatar
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From: Columbia City, OR
Car: 20 M550i xDrive
Engine: LB9 305 TPI
Transmission: Auto
Axle/Gears: 3.23
Re: 86 IROC-Z Auto w/ 3.23?

I thought the options for an auto were only 2.73 and 3.42, I must have been mistaken.
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Old Aug 19, 2019 | 04:11 PM
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From: CT
Car: 1984 Chevrolet Camaro Z28
Engine: 5.0 Liter 4-BBL V8 High Output
Transmission: 5-Speed Manual
Axle/Gears: 3.73
Re: 86 IROC-Z Auto w/ 3.23?

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Old Aug 19, 2019 | 08:55 PM
  #6  
Morder.'s Avatar
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From: Columbia City, OR
Car: 20 M550i xDrive
Engine: LB9 305 TPI
Transmission: Auto
Axle/Gears: 3.23
Re: 86 IROC-Z Auto w/ 3.23?

The 3.23 is optional with the G92 package? So shouldn't both GU5 and G92 be present on the printout?

Sorry if I'm making this more confusing than it needs to be.



I found this thread and I think that may have cleared things up for me. Thanks for the help everyone.

Last edited by Morder.; Aug 19, 2019 at 09:10 PM.
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Old Aug 19, 2019 | 11:56 PM
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Re: 86 IROC-Z Auto w/ 3.23?

Buddy of mine has 2 86 irocs that are of the LB9 and 700r4 variety... both 3.23 gears. Both of his heaps are J65 and G80 cars as well.
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