<font face="Comic Sans MS">As the others have stated *Do NOT* do that on 1/2 ton axles. Even for street use. Reason being if it goes out while you're driving (snap axleshaft in rear for example) it is a *very* serious safety issue. That 44" tire rollin' down the road could *kill* someone if moving fast enough.
Upgrade those to *at least* 1 ton axles (Dana 60 front and Corporate 14 bolt FF rear) before even pondering 44's.
I would go with a 6" suspension, 2" body and fender trimming. It *can* be done to look *very* good if you take your time and think it out, draw it out, get opinions, etc... Plus you'll have a suspension that actually flexes a little so you don't get a ride like an old covered wagon. With springs arched that much you might as well weld the axles right to the frame. Should ride about the same. [img]/wwwthreads_images/icons/crazy.gif[/img]
Plus that high angle driveline will cost a lot. Having some decent drive line angles (half the lift or so) could save some $$ in that department too.
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AHHHHHHHHH!!! I forgot the *MOST* important upgrade to run big tires... BRAKES!!!
You need very beefy brakes to stop those meats. They not only weigh a ridiculous amount but a rotating mass *that* big will have a ridiculous amount of rotational inertia. It takes HUGE brakes to stop those in a reasonable distance. Before you even consider ANY of the other factors, figure out how you're going to get brakes on that rig that fit the bill outlined here FIRST...</font>
The one and only 'Sandturnip'