what to build a gt6000 as a mud mower or mid 80s craftsman

ok ive got a craftsman gt6000 it has a magnum 18 hp and a 12.5 38 craftsman im wanting to build a stout mudder and something that i can take over rough terrain and that will flex not gonna push it hard just trying to have a little fun

ideas toss them at me oh and im very cheap mods have to be bang for the buck tires are on the list of things to do

Does that GT have a 3 speed hi-low or is it a hydro?

3 speed hi lo

Ok, what year

im not sure the year 80 something
its in the first part of this vid >> https://www.youtube.com/watch?v=u3tgknUcKYk