Nice 6.25 year old necropost!
The G92 might be a redundant code or an enforcement of the GU4 code.
Similar to transmission codes MX0 and MD8, which will often appear together, where MX0 is Merchandised, auto with OD, and MD8 is THM700R4/4L60.
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1988 9C1 - Modified LM1 @ 275HP/350TQ - TH700R4 - 3.08 8.5" Disc Rear - see it at
http://www.silicon212.org/9c1!
2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness!
1967 El Camino L79/M20 old school asphalt raper
Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have.