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Discussion Starter · #1 ·
In 1999 I had a GMC Z71 pickup. Had lots of issues with it. One of them was a problem with the way the transmission shifted. One time when I took it back for service, the service manager went to his computor and checked for new shift codes for my transmission, and there were some. He downloaded them into a handheld unit, then to my truck and it helped the situation a lot. Question, does anyone know how to find out if there are any new shift codes for our trucks? My transmission is really sloppy shifting on hard excelaration. My dealer is great on service, but they are not big on promoting me to modify my truck in any way. Edd
 
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