my 2001 duramax from a stop and then quickly accelerates and when it shift from 2nd to 3rd it will pin the rev limiter and slowsdown alot then you have to let off the accelerator for it to shift. I took it too a tranny shop and they told me the allison tranny was low on oil so i had it serviced. A little while after i got it back it did the same thing so then i decided to take it to chevy so that they can diagnose it. Chevy told me that the transmission was overfilled and that it threw the perameters of the computer off and that would have to be reflashed. I didnt have chevy fix it because i had someone else work on it and thay said they would take care of it but they say that the tranny oil level was fine and that Chevy diangosned my truck wrong. They want to look further into my tranny again and nobody seems to know what it goig on with the tranny. My truck is throwing alot of codes here they are:

P0093- Fuel System large leak detected

P0089- ECM Fuel pressure regulator

P0168-ECM Engine Fuel over temperature

P0568-ECM, PCM Cruise Control Set Switch

P0571-ECM, PCM Cruise control brake switch circuit

P0611-ECM Fuel injector control module

P0621-PCM Generator L- terminal circuit

NE106

P1683

P0563- System voltage high

P0380- Glow plug heater circuit A malfunction

P1643-Wait to start lamp control circuit

P1261-Injector positive control circuit

P1262-injector positive control circuit group 2

P1550- ECM Fuel injector control module system voltage

P1639- 5 volt reference 2 circuit

The Allison A/T is a good solid reliable transmission. Don't bother with independent shops. Go to a Allison authorized/licensed shop, you'll be money ahead in the long term. Many Chevrolet dealer service departments don't even have Allison authorized technicians. Where I live there is only one in the county, a GMC dealership.

I took it back to chevy and they have a certified allison tech.They ran another diagnostic and went further into it and said that the transmission control module had to be replaced.thanx for the replie