what sort of failures? are they transmission, differential or inching linkage related? are your trucks all 2 years old or are there some older units too? what type of operation are you using them in. Mitsubishi traditionally had a "stiff" engagement through the controls, and have had some linkage and cable concerns over the years, but nothing that a well trained and concerned tech should not have been able to take care of as part of routine and scheduled maintenance. MCFA also had a warranty period that is longer for "power-train" (transmission, diff, engine block) that should have covered most of your problems up to that 2 year point, I thought.