Driveshaft angle is an issue with ANY vehicle. When you change the angles, you both increase wear and tear on the u-joints, and reduce their life dramatically. Thus, the prevalence of aftermarket shafts.
Next up, OP- is that a Dana 30 up front? Can't really see in that postage stamp pic
If so, I HOPE TO GOD you have it beefed up! Even if it's a stock 44 (same able tube size), you'd better sleeve that sucker, and reinforce your C's!
Next up, oh God, yes, you'll need driveshafts! I'm assuming that since you're not seeming to have problems yet that you at least have adjustable control arms. These will HELP, but cannot solve driveshaft angle problems. Too much angle is too much angle- to compensate, you'd have to dial out pretty much (if not all) all of your caster, which would drive like hell at that height. New driveshafts are a good investment in your case- call Tom and the guys at Tom Woods- they'll take good care of you. Straight up guys, those- Mark W.