I purchased a new72" super z about two months ago and have now had the gearbox go out on me "twice". What a pain in the butt! Why do they use a gearbox on a 72 instead of the typical hydro/ belt system? Whats the deal? Why does the gearbox keep going down? My dealer is an hour away and its really hurting my maintenance responsibilities and customer relations. I own an Exmark and haven't had any problems in two years! I went with the Hustler because I thought it was well built. $10,000 for this?