I have a model 817 re-powered with 12 hp Kohler. I found a late model 8122 I was going to use for parts. Mainly the late style clutches and controls. Both trannys have issues.The 817 needs a bearing at the brake hub, and the 8122 has a cracked case. I can rebuild the tranny for the 817 using the later clutch shafts, or use the pump from the 817 for the 8122 and convert that tractor to hydro. Any thoughts?