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My father has a 2008 2500hd with the 6.0 4:10 gears no mods. He is hooked to a trailer everyday ranging from a ton to 4. It has good power for pullin but when a goes down hill it wont hold back trailer or no trailer. he tried the tow/haul on and even when he puts it in 1st it still takes off. took it to dealer they said thats gm fuel economy. dealer said there is a after market programer/chip that will help defuel it for hold back and wont hurt performance. Any ideas