Thanks Ed
View like this...
ZV6 = M20
ZV7 = M21
ZV9 = M40
ZW1 = M22
It's very logic
But for what GM Canada show the two code on the same paper.
RPO M22= 4-speed H.D. transmission close ratio and
IC ZW1 = 4-speed H.D. transmission close ratio
RPO PL5= F70-14-4 PR tire -HWY-OE-B/wall white lettering.
IC ZP1 = C.O.P.O Tires
RPO for Regular production option and
IC for Internal Code
This IC code it's only for canadian COPO or All USA and CDN COPO.
This one is the best from GM
RPO ZP3 Regular Production Option Special Order Paint and
two dash - - on the tag for Paint Deleted.(USA and CDN)
