Trans Slipping

[golfballs]

When im on the highway my trans slips. I get no codes and my fluid is not burnt. I have a 2000 gmc savana g2500 5.7.

Thank you inadvance for you replies.

[srlbotanical]

Time to take it in to a tranny shop you trust and have them hook up their computer to do a driving test. I would ask to have them pressure test it at the same time. Plan on spending $35-$50, but you will know exactly what is going on. If you can catch transmission problems early, often they can be solved with a shift kit and servo upgrade.