Welcome! i also saw your post on Pirate, i was going to post up but then i saw the other post on the offtopic section.

i think it's a great idea to SAS the front of you're truck and i also recommend a ford link setup. as for swapping in a d44 in the rear <img src="/forums/images/graemlins/shame.gif" alt="" /> that is kind of a downgrade in my opinion, i wouldn't run a weaker axle just for lower ratios. I run 35's with 4.90's and my 3.5 moves my truck fine, you have the 3.0 so i guess it could be different for you but i'm pretty sure you can get 5.29's for that axle which would be cheaper, stronger and less work than swapping in a d44 out back. Even if you kept 4.63's in your truck and spent your money on a t-case that would help out more offroad than lower axle gears because 4.63 with a
good low range it wouldn't matter what ratios you're running
here's some t-case options for your truck
Outerlimits4x4 Atlas
klune