star2323 Posted June 3, 2010 Posted June 3, 2010 I have a 2003 2500HD with 8.1 and the Allison transmission. When driving down the highway (50-70 MPH) and I go up a hill it feels like something is sliping in the transmission. It is a slight slip or shack and it does it a few times and then when I get to the top of the hill it is fine and stops doing it. It is more noticable when I have the cruise control set. I have watched the RPM and MPH when this happens and neither one changes. They hold consistent. What could be going on? Is it something with the transmission?
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