You probably are getting the 14 Bolt cab and chasis rear end. That is actually narrower than the stock rear axle. You'll be going in two different directions - front wider and rear narrower. Once you get the axle, post up the WMS to WMS dimensions and we'll let you know what axle you have. You'll need a Dana 70HD rear to match your front dually Dana 60 if you want to run Hummer rims. 14 Bolt and Dana 70s are pretty cheap and common, you're getting the expensive axle (Dana 60) with the deal, so don't sweet the rear end, you can always sell what you got and pick up what you need.
As for the Dana 60 front dually, you can switch the front bering hubs to single hubs and you can use regular wheels (not Hummer or dually rims). I picked up a pair of new reproduction units for around $170 each (you'll need 2) or try and find them used, but they are scarce and not much less money.
The front axle will bolt right in. You'll need to shorten the front driveshaft. The 14 Bolt cab and chasis and the Dana 70HD rearends will need the spring perches and shock mounts moved. I'm not sure about the driveshaft. If you decide to swap the hubs on the front axle so you can run regular rims, then you can sell the rearend you get and pick up a 14 Bolt FF from a 3/4 ton rig. The 3/4 ton 14 Bolts FF are a direct bolt ins (again, I'm not sure about the driveshaft). The only thing you'll need to work out is the parking brake cable set up ... that's a whole story by itself! If you go this route, make sure the gears in the axle you pick up match those in the Dana 60 front.
Good Luck,
Eric M.
......either way i still plan on trading axles cuz they're still better then what i have now. And if it does come down to the rear axle being shorter then the front, theres a truck in the junk that i got my t-case outta that has a 14blt ff in it, and its the reg. length. ANd if it needs a new rear driveshaft thats no problem cuz i have to get one made up anyways cuz im changing from a 203 to a 205 t-case. So ones gotta be made up anyways.
