bcp
In My Opinion
We have a GMC 3500 dually & pull a 32 foot camper trailer. My husband keeps mentioning a "chip" that would give it more umph? Do you have this or know anything about it?
I have this. Bully Dog
I think the dealer will put an economy flash on it for you too if you know someone there. 40hp increase is most likely all you want to boost it by. That gives a bit better economy towing or empty, not enough of an increase to make you want to play at stop lights and its still safe for the transmission. Even the stock Allison is not recommended to exceed a tune higher than 90hp, however I have pushed mine to the limits before and it held just fine.
I also added 4" down pipe and exhaust and a cold air intake.
I can tow all day at highway speeds in all terrains without the truck ever showing any sign of excessive load or strain.