Allison Transmission Issues with Fifth Wheel Towing

Volume 1 Issue 4 - Duramax Issues and Answers

I have a 2002 Duramax 6.6 turbo 2500HD and pull a fifth wheel (about 8500 pounds). I have been told there is a second filter inside the pan of the transmission that should be changed. Does the back pressure method of changing the transmission fluid do an effective job of cleaning this filter, if it has one? I have also been told that it is not a good idea to change the transmission fluid very often. Is this true? My transmission temperature reading gets above the 200ºF mark almost every trip during the summer months. Is this to be expected?


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Joel Paynton is an award-winning GM technician who specializes in Duramax fuel systems. He also does custom programming for any GM powertrain. Visit him on the web at


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