okay so i am in a bit of a bind, i am doing a cumins conversion into my 1990 crew cab long box dually. i know i have a 14 bolt in the rear but not to sure about the front i am pretty sure it is a Dana 60 but not positive ?. i am putting a Allison behind my cumins but to get my gearing right for usage on the highway i am wanting to use a 3.42 ratio needing help to find out if i can use that ratio in the front axle as well ???