Quote:
Originally Posted by Blacdout96
If your RPO code sheet does not have the designation B4Z, then you do not have an IROC. In case a door was replaced, you could always look at the 8th digit and see if it' the letter. If it does, then there is hope. Almost all IROC's had an 8th digit of G.
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Well I'm most positive that its a Z28 . I'm not keeping it . All I wanted was the diff and a couple other goodies .