ok so with the ring gear gone you have no choice but to regear, id go 4.56, for the shear fact that you will regret goin 4.10 later your milage wont suffer that much if any at all, marcus had 4.56 and 32.x" true hight brutes and his mileage didnt change iirc. i also wouldnt buy new shafts, thats just money you dont need to be spending at this point in time, im behind on my 1/2 ton gear/locker costs but marcus bought the same setup, im just not sure what he paid for it all, although 1600 sounds a lil steep, if it did mess something up i hope its the tcase and not the trans for obvious cost reasons and if you end up needing my tcase just let me know