I am looking at a 2003 2500 4x4 with 85000 miles and the 5 speed manual. I understand that means it has the 250 HP cummins. WIll a bullydog programmer(tripledog) work on it? will it break the transmission? is this motor identical except for rpm band to the 305 HP HO engine? is the 5 speed as tough as the 6 speed NV5600? does this model 5 speed have the 5th gear fall off the end of the shaft? i am looking at buying a truck on ebay, so am wondering if that's a good idea from a dealer.