Shackle question?

I'm lifting the front of my truck with fabtech's 3" kit including uca's and coils. has shock absorbers included.

With the back, i plan on running 2" shackles. I've heard some replace the rear shocks and some haven't. i don't want the kit if i'll be in need of $200 extra for the rear shocks. If so however, which shocks would you prefer?

 

Yes, you should replace the shocks. 5100's are highly recommended, but you should do an actual measurement to find out what length you truly need.

 

Damnit. 51's all around? i don't like mismatching parts, but i've heard bilsteins destroy fabtech suspsension all around, so maybe i can budge