A 2.5 inch is a direct swap from stock track. Just order from trackscanada and install yourself. Sell your stock track and you have by far the best mod for the buck on that chassis period. Dial in clutching and it is way better than an equivalent stocker. 3 inch also works but a bit more money as you have to get smaller drivers put on as well the 3 inch is a bit of vibration, although the thing will be a tractor in the hills. Cuso has it right.
3 inch with 7 tooth drivers will work but everyone I know that has done a 3 inch without a drop and roll is loosing lugs off their tracks. Not sure why but just our experience. 2.5 has no issues with stock or 7 tooth drivers