Jul 2, 1998 — Check out my GM Speedometer Recalibration page. 1970 and earlier axle code example: QY 01 01 G E. Ratio, Month, Day, Plant, Posi Source.
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DOWNLOAD: https://tinurli.com/2fbhxo
gm-rear-end-codes
Oct 4, 2014 — History / Originality - RPO codes for gear ratio - Hey guys' I have an 86 iroc, I would like to find out more ... Here's a list to all of GM's RPO codes 939c2ea5af
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