could be d-dogg. i kind of thought of that as an after thought. don't know how many driffernt model of snow throwers mtd made for the 990. but mine is power by the middle pto. uses the same u-joint and shaft that the lawn deck uses.Jheck, my 72 uses the front pulley as well. Is it maybe the different models of blower which dictate front pulley versus mid PTO?
Flejl, which blower do you have for yours?