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I have a stock early 2004 duramax with the allison automatic. Over the past few weeks I have been having sporatic problems with the transmission. Under heavy acceleration (pedal to the boards) the engine hits the shift point rpm but the transmission will not shift. I have to relase the throttle a little then it will shift. This happens shifting from 1st to 2nd and 2nd to 3rd. I have also noticed that under normal conditons the transmssion seems to be searching for a gear or down shifts at times when its not required. I friend told me that it is probebly an external shift regulator (he was not sure of the exact wording) can someone give me info thanks
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