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Originally Posted by OldSuperSport
I still dont know what transmission I have, or the engine "vin letter" , what does vin K vin J vin P refer to? Its a towing pkg truck with dual radiators, 411 rear, so its a 4L60E or 4L80E I think. I need these to detemine the ECM protocol set.
Thanks again
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You're welcome
Use the “RPO” codes in the glove box to determine which transmission you have. These are possibly the right codes for your truck.
MT1 - TRANSMISSION,AUTO, 4 SPD, THM 4L80 -- E
M30 - TRANSMISSION,AUTO 4 SPD, 4L60E, ELECTRONIC
Here are some sites to look up what the RPO codes mean.
This is a good site
http://www.wiu.edu/users/muwtj1/me9-nc6.txt
This site only list up to 2004
http://www.gm-trucks.com/RPO_2001.shtml
Some codes on this site have less info.
http://www.geocities.com/n1qcr78/rpo.html