Starting in the rear..... the easy part. 1st, rip out the rear end.
Then you re-arch the springs and add a full length add-a-leaf. Afterwhich you position the axle under the lift springs with custom made spring perches that fit in the back side of the old perches so there is no need to weld.
Mock up the tires and wheels to see how they fit.
Bolt everything up and drive it out of the shop to turn it around.... looking at the ground.... seatbelt keeping me from eating the steering wheel .... with only 1/8 inch spline engagement of the rear drive shaft slip joint in the t-case! <back>