Yes, you can use the stock drivers with a 3 pitch track. You should just get a 15 wide if you are not replacing the drop brackets and skid. I run a 16 wide but I had to do some grinding to make it fit, also I do not use the stock drop brackets. The 2.5 will clear the front heat exchanger and tunnel easily.
thinking of doing the same ,only with a 156 x 16 x 2.5 with a K MOD skid and ice age rails from an artic cat , to improve snow approach angle . will this work