1988 Ford 4610 Tractor Right Front Axle Knee Spindle Holder Housing Posted onApril 24, 2024CategoriesfordTagsaxle, ford, front, holder, housing, knee, right, spindle, tractor Up for sale is a right axle knee. It came off a 1988 Ford 4610 diesel tractor. It appears to be in good condition. The spindle tube is 6 7/8 (not including the stop).