Hello Greg , I am sure your Dad had them done a couple of times if you guys had upwards of 20,000 hours on it unless he replaced the trans. at one time . I also run an extra gallon or so of oil in them so the splash is heavier and lubes them better . I run extra oil in all of my SOS's too the 801/4000's will cavitate on a steep side hill when I was pulling logs with them finally stopped it with an extra gallon in them . Thanks Tony
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