I am buying a Bighorn 3400rl and was wondering which rear end I need. I want the 1-ton Dodge Mega cab, diesel motor and the auto tranny. Do I need the 373 rear end or do I need to go with the 410 rear end. You guys know what you are talking about and I need your help. There is one truck in Ca. like I want but it has the 373, is that enough or do I order one with the 410. Thanks again.