[Gmecm] BCC lookup

[Mike V]

> AZTY <<=====<<  1992  3.1L V6 Auto trans, from a 7730 ECM 
> ASMY <<====<<   1987  2.8L V6 Auto trans, from a 7730 ECM 
> ARPM <<=====<<  1991  3.1L V6 Auto trans, from a 7730 ECM

HTHs
MV