Mile Marker Conversion Kit Ford & GM 203 N.P.. Our Mile Marker Kit is the result of over two years of experimental kits and testing. It has all of the advantages of the best shaft type conversion kits yet it uses all the original parts with now new yokes necessary. It has none of the disadvantages of the crown type kits by being one unit. No thrust is applied to the bearing. Our bearing serves as a spacer to keep the chain sprocket clear of the planetary ring. No elbow for extra oil. Simple-Easy Installation. Fits all 203 Transfer Cases. Fits All Transfer 203 Cases. Specifications for Mile Marker 501 Conversion Kit Ford & GM 203 N.P.: Manufacturer: Mile Marker Quantity: 1 Package Contents: Mile Marker 501 Conversion Kit Ford & GM 203 N.P. Mile Marker 501: 501 Conversion Kit Ford & GM 203 N.P.