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As far as I know, it should be ok. But if you do need one, it may be just as good to get a longer one and take it to a machine shop and have it cut and balanced.
I have a 6" lift and don't require a longer driveshaft. When you've got a reg cab/short bed, than you're wheelbase is shorter and on a 6" lift you'd need a longer driveshaft, but on a 4" lift you're ok.
Thanks for all the help guys its good to know that i dont have to worry about it once i receive the lift. Now i just have to worry about affording bigger rims and tires.