Anyone running 2.5" Pro Comp on 15" wheels?
 

Was looking at the 2.5" Pro Comp lift and it say's that they recommend running 16+ wheels but I've seen people running 15" on a 2.5. Is anyone out there running this lift with 15" wheels or does anyone know why this kit wouldn't be able to run 15" wheels? By the way, the wheels I would like to run would be 33/12.5/15.

You can run a 15" wheel with any lift. You just need to make sure the back spacing is correct. I run a 15" wheel and did so with a 2.5" RC lift and am still running a 15" with my current lift. :D

Would I be safe with 3.75 or should I go with 4?

I think that at least a 16 would make a better ride quality...