I would say that bumping up to a 35" tire with 3.73, depending on the brand, you are going to notice a loss of power. Personally I would say just to save up for gears, do a gear swap, and then run the 35's. Also what brand lift are you running? Keep in mind also that if you have your front end cranked quite a bit, bumping up to a 35" tire is going to increase strain on the front end because of the added size/weight!