You will need a 285753 Washer Motor Coupler Coupling Assembly. Kenmore and Wirlpool washers share the same drive (at least this model), so look around for pricing. Sears sells it for about 15 bucks, but I found it online for 8 bucks.
Go to www.sears.com and look up parts for a model 227722101 washing machine. You can get an expanded drawing there too.
I have not replaced mine yet, so I don't know how hard it is to do. I don't think it will be too hard though.
Rob Pendle, September 2005