Help With Track Pitch And Clearance

I need some help to understand the track pitch and clearance. I am swapping out my 2" 151 for a 159. I see different pitch tracks - 2.52 and 3.0. I understand the diff, but what does that translate to on the drivers and tunnel clearance. I was looking for a 2.5 or 2.25 159. Can I slip in anti-racket drivers? I am riding an 05 RMK 800 in the central Idaho mtns and need more track. My sled comes with a 2.52 pitch track. I will also do a BWK with 2 8" wheels inside of rails at same time.

I am about to do the same to my sled. im going with a 162" 2.5 lug. how did yours work out? what track did you decide on, did you have clearence problems?? GOT PICTURES.....LOL