I'd say you should get some new arms. I don't have the Currie arms, but that's what I'd buy if I needed new arms only because I do wheel mine once in a while. For you and not much wheeling you might find something more budget practical, but definitely read reviews and choose wisely.
I would want to replace the arms myself if they are indeed stock ones. 4" of lift is too much to have the stock arms. I know it doesn't bother some, but I hate the look of having the wheels (mainly noticeable to me in the rear) pulled forward and from where it should be when lifting it that much and still running stock length arms.
Not long ago, I would have been on the bandwagon of not needing to spend the money on the Currie arms or any of the other double JJ set ups, but through more and more research my opinion has changed. Besides fixing the issue I mentioned and being adjustable so you can eliminate possible drive line vibrations they also ride better or so I have read. The price of $1000 seemed crazy to me originally, but then I got to thinking about it and that is only $250 as set (front uppers, front lowers, rear uppers, rear lowers) which doesn't sound bad at all to me for what you are getting and I plan on having them once funds allow it. Added to that is the benefit that if you go ahead and get them and later on decide you want to do more and say get rid of the t-case drop, add a SYE/CV driveshaft, you already have the arms you need.
I just got some rokmen front and rear lower control arms and their great quality 300 for each set so 600 total you can get a package deal with all 8 arms for around 1000 I got a three inch suspension and hit a ditch a while ago and tore my front passenger lower control arm mount almost off. The stock arm was bent a little but off road shop said that I wouldn't need to upgrade. They didn't know I wheeled it. Then after a couple mud trips the arms started squeeking and I brought it back to then the they said that if I wheeled I would need to upgrade. I looked Arlington and saw the rokmen was one of the best so I went with then I have the fronts already on and the rears will be going on on Tuesday. With a three inch suspension my rear tire is not centered in wheel wheel so I imagine that with a 4 it wont either so I would get some arms. Look at rokmen