I haven't tried out the stump grinder yet. The wife had other priorities she wanted me to do first. I think the shaft is straight. Time will tell if i change it or not. I like the 4n1 bucket so far. It helped alot with filling up the wife's raised beds with dirt so she could start getting the vegetables planted. Eventually i will be getting a grapple but i think i would get it from markhams welding rather than power trac.