You will need a longer drive shaft, but you will also need to do a gas tank lift,
otherwise the diff portion will impact the bottom of the tank at full stuff.
As long as you are making longer control arms (lower) you should look at
relocating as close as you can to the pivot of the U-joint at the back of
the tranny, this will eliminate the amount of slip in and out of the Yoke.
Post some pics of the front move as well
Wild
I already modded the front LCA out and forward but failed to take pictures. I also removed the stock bushings from then and installed a piece of 1.75" .120 wall DOM in the larger side to make the ID the same and installed Energy Suspension bushings with their sleves and drilled out the front holes so I could use the same size bolt front and back for the mount (cant recall but I believe both are 5/8 now).
So you're saying remoce the stock brackets on the sides of the frame rail and make even longer arms at the same time so the pivot point is closer to the u-joint so it doesn't move in/out the case as much? Sounds good!
A 2" body lift is next as I already rub under compression with the LowRange offraod coil/strut spacer kit with my 30x9.5 BFG A/T. I want to go with 32 or 33" tires next but I have other plans before that.
Here's a quick .gif I made to represent what I want to do, before is with the front control arms already modded but I'll be getting another set from the junkyard to make it out the 5/8" still but forward around 1.25" total and the rear will be moved back slightly more then represented.