Rookie, you mean the axleshafts?
He is talking about extending the torsion beams 4" at the ball joints. Similar to what Camburg, Baja Shop, Mcneil, Autofab would do. The reason for the 4" over stock is because dana 44 TTB outer axleshafts can be used. Also be extending the beam after the radius arm the pivots and radius arms dont have to be changed.
However the ball joint must be re-located to correct camber for the new lift height.
It sounds like you are on the right track but it also sounds like you are just getting started. Do you plan to truss the beam as well for strength?
Do you know how far to extend the beam in order to be able to use D44 axleshafts?
Doing so can save you ALOT of $$$.
really Long travel TTB's can have $1500+ just in custom axle shafts.
Basic:
Super expensive really long travel ultimate TTB:
Also you can buy beams from shops already extended correctly fairly cheap when compared to trying to fabricate your own. Its not nearly as fun though

Plan on building a couple of sets before you get it right at least

it took us 3.
There are a few ways to modify the TTB, cut and turn and extend the beams. Even equal length has been attempted.
Autofab now has a kit out that allows you to mount a modified long travel D44 TTB UNDER your D35 TTB equipped truck

drool drool......