All the steering and brake parts are the same as your 2WD parts, if they come burnt on the used axle. All parts are the same from the ball joints out!

Make sure that the tubes are straight on the axle, they are notoriously weak, and the fire may have caused them to sag if it was hot enough. If you plan on wheeling it, there are tube reinforcement kits available.

The weak link with most lift kits is the track bar bracket that is welded to the rear axle, most lift kits extend the factory bracket, the side to side movement against the extended adapter tears the stock bracket off the axle! There are reinforcements for the bracket available in the aftermarket.

There are some electronic differences in the stability control system between the 2wd and the 4wds, I'm not sure, but you may end up needing to have a 4wd module fitted or maybe the aftermarket has some way of disabling the module. The 4wd module allows you to disable the system while in low range 4wd. The stability system is connected to the PCM to control the throttle, and to the ABS system to control the brakes. If I remember right, it's built into the ABS module, these are only available to be ordered to a specific VIN, and they have to be configured through the CAN Bus system, which makes swapping modules very difficult!

Also, to avoid problems, make sure that the steering wheel is perfectly centered after the lift is installed, if the wheel is even slightly off center after the lift and you drive it in a straight line, the stability control system will kick in, cutting the throttle and applying the brakes on one side to control what it thinks is an understeer condition.

A 4 inch lift may require driveshaft modifications.

Everything mechanical is a simple bolt up as far as the swap goes! The 4wd skid plates can be added, too.

Hope this helps!