Question about Chevrolet Silverado 2500HD

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My 2004 chevy 2500HD has a 6.0L and a 4l80e transmission. The problem is the trans over heats up around 300 deg. and at that point it shifts into every gear extreamly hard. I took it to aamco which i will never do again, and they were suppose to put in a HD shift kit. There were no problems till they did that and know under a complete new workforce they don't have a clue what is wrong with it. A code of p0864 pops up but they serched it and had no luck with it. It's under warrenty but those idiots are very unskilled at what they do. Please help.

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P0864 TCM Communication Circuit Range/Performance

Bad connection or configuration, need digital tools to solve it (sample: Duramax LBZ X-Tuner)

Posted on May 06, 2010

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I have a 1999 Chevy 2500 he diesel and over drive pops in and out...now it will not shift from first


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