Jay has 33x12.50R18 Toyo Open Country MT's on 18x9 XD SPY wheels = very heavy setup. The 3.73's we installed in his 05 WK 3.7 made a world of a difference. Like Matt said, there is no need really for 4.10s for guys running the 3.7 liter due to the nag1 trans. Especially when a 3.73 swap is so much easier since you can get a front diff for a 4.7 liter that ready to bolt in.