I found a websight that lists RPO codes and i was comparing mine to the list and i see that i have the MN6 code which is "Merchandising option 6 speed" which is different from the regular MM6 code for regular T56 6 speed. Also i have the Z28 code on there which the websight says "Merchandising option-special performance". Anybody else have these codes or know what merchandising options are??? Oh and the websight is http://www.f-body.org/tech/4th_gen.htm and the RPO codes are at the bottom... Thanks.


Chris

 

The way I interpret it, MM6 is the code for the tranny, itself. MN6 is for the different supporting hardware for the transmission.

Z28 is for all the supporting hardware included in the Z28 package, since it is not just one thing.