Trucks newer then 94 moved the front axle center section to the drivers side so your existing transfer case will not work. Plus the coil overs would make them a pain. So you will be looking for 80-93 front axles, or just everything from the knuckle out(D44 only) its not hard to swap them.

They are all the same width though so I am not sure how you will find wider, unless you found a dually front end with the extensions but those would probably be too wide.

The transfer case would either need to be converted to part time or swapped out, this involves changing the transmission output shaft and adapter.