HI everyone. I ma new to this forum but I can see I am going to spent lots of time here. I bought a used 05 Duramax. Truck had about 16000 miles on it. I have driven it about 2000 miles on it and love the diesel. However I towed with it for the first time this weekend. My travel trailer only weighs aobut 5500 loaded and the truck pulled in the mountains perfectly. On the way home coming down the hill when the tranny downshifted it went clear doen to 2nd gear I think and red lined the truck to 3500-4000 RPM. I could power through it but I really think I have a problem of some kind. I know the pryor owner towed a 32' fifth wheel with it. Is is possible that he had some tranny kit installed for the heavier trailer??? On some of the downhill it worked perfectly but three times it went over the top...Thanks for any help...
tractman
tractman