Well, I got My 06 Nytro sitting in the garage and getting ready to make some adjustments. I was going to go with the 136 ZX-2 and now thinking maybe 144 Expert. IS 144 to much? I would hate to go 136 and then end up wanting more. I dont trail ride much anymore, mainly boondock and get out west once a year. decisions, decisions! IS the drive shaft 1 1/16? I am going with some 9 tooth Wahl drivers and 1.5 intense track. I still will trail ride so I'm keeping the lug there..maybe 1.75! Powder pros are on..just need to get the track figured out.