What I would do is put the stock lowrange gears in the front box and get either Marlins 23 spline 2.28:1 gears or the 4.7's that way youd have the better input in the rear as the Marlin input gears are far stronger than stock. It wouldnt be a good idea to put a weaker of the 2 inputs in the rear as it sees far more torque than the front case.