Yardman MTD 17hp 42"cut Model#13At604G401 Autodrive. Mother in law had transmission replaced a few years ago, now it will act like it is down shifting or slipping. It has a relatively new drive belt(2yrs old). She cant afford to replace it again. Is it possible that it is in the rearend and may need relubing? Thanks and God bless.

edgar critzer, June 2010