You can probably get close to 4" out of the T bars. The problem with that though, is that at such extreme CV shaft angles there is a great deal of force that is being absorbed by the CV joints rather than being transferred to the wheels, making it much easier to break cv joints. You can aleviate much of that problem by modifying the axle housing brackets. There is another post on the board that goes into a little more detail about how to do it.
You most likely are looking for extra clearance for bigger tires, which also is going to increase the load on your axles, so if you want to try cranking your T-bars up that high, and use your Vx for offroading, you definitely should think about the housing brackets.
If you are not overly concerned about the ground clearance, you might want to consider sticking with 3" of suspension lift and an inch or two of body lift.
If you are one of those extreme offroad fanatics, you might consider a solid axle swap in the front. That would take care of the tire size limitations at the rear of the fender-well as well.
There are other options, but they just get more and more involved.
My opinion is that you should use as little lift as is possible. Only enough to accomodate your tire clearance at max suspension travel. (which still may be substantial) Any more height than that is needlessly wasted on raising your center of gravity. The last thing you need is to be driving a tippy truck that will roll easy.
Hope this helps you with your descision. It depends so much on how you use your truck. If theres anything I can do to help, you're welcome to e-mail, or call me.
Andy
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