Atm I'm running 10" 450 up front, 12" 350 in the rear. I was planning on switching out the fronts for a 350-400 and figured I can just reuse the springs for the rear and that's one less thing I have to buy. A 12" should work out fine for the front and I can get rid of the helpers up front too. I'll probably go with a 275-300 12" in the rear.