Is it possible the grease is comeing through the splines. It,s a good idea to put a little RTV on the yoke splines before putting it on. Are the bearings O.K.? Loose brgs. can cause a leak also. The seals usually don,t leak that soon from a rough yoke surface, although it certainly shortens the life. You might check the parts store & see if a speedy sleeve is available for that. That is the best way to go.
