I have a 2008 420 rancher and i just added a efi programer exaust and filter . and a set of 25 " maxxis big horns and i was going buy an epi clutch kit with the comp stall i like to run rocks but i need to get to them so is the comp stall to much ?
Economy kit will do all you need. Comp kit for guys running 27" tires and bigger and running in deep muck. Most of these guys will also do a gear reduction and locker.
I've got 25" T/C on my 420 and have the econo kit and it works great. Even at 10,000 feet where power is a third of what it is at sea level.