What else do you have done to your truck?
I've got the Dixon Bros LT kit up front, AAL rear, and a pair of bumpers I made myself, along with some other smaller stuff (fenders, winch, lights). Next week I'm starting a swing-out tire carrier and hopefully putting on some rock sliders if time permits.
IMO, I'd get that BTF kit on first seeing as you already have the coilovers. You'll be amazed at what happens with the ride quality
Best of luck with that rear axle, I really want to see where you go with this build!