how do i read these RPO codes
Joined: Nov 2008
Posts: 2,090
Likes: 175
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: how do i read these RPO codes
I'm not sure what was the hang up to looking up your codes. It's fairly cut and dry with this SPID decal you pictured. From the factory as a 88 Iroc, automatic, 305 tbi, 2.73 axle. You can check code manually here https://www.angelfire.com/on3/whitel.../ThirdRPO.html
I will note that 88-90 did not use the code B4Z on Irocs. There was no 'standard' Z28, so if the code Z28 was used, it was automatically an Iroc too.
I will note that 88-90 did not use the code B4Z on Irocs. There was no 'standard' Z28, so if the code Z28 was used, it was automatically an Iroc too.
Joined: Nov 2010
Posts: 5,891
Likes: 84
From: Mantua NJ
Car: 1 Owner 1986 TA with a WS6 package
Engine: 5.0 EFI
Transmission: THM700R4
Axle/Gears: 277 Posi Speedo
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