I'm doing a gear swap in my 2012 and can't decide between 4.56 or 4.88. Will also be doing a spool in the rear and locker in the front with 35" tires at the same time. Target RPM is a minimum of 3500 but not looking to go over 4200 to stay in the charger and cam's sweet spot. I will also be swapping between the BOB 2.5 charger and a 2.6 smooth bore where I have to.