Differential Case YC F900501 ,&,28spl,2or4,31spl,4 TAB CLUTCHES,9,BARE,CASE,DIFFCARFO9,F9-CARPOSI,FORD,HALF,HAT,PIN,POSITRACTION,T/L,YC, Yukon Trac Loc case for Ford 9 9" FORD T/L CASE,BARE,28spl and 31spl, 2or4 PIN,4 TAB CLUTCHES 9" TracLoc case, bare, 28 and 31 spline, 2or4 PIN, 4 TAB clutches. Yukon Gear and Axle manufactures a full line of standard open and positraction limited slip carrier cases for a variety of applications. Each unit is cast and machined to exacting specifications to produce a carrier that provides both high strength and tight tolerances for a long and reliable service life. This case is loaded with spider and side gears. Trac Loc Positraction carrier case Does not include spider gears Fits Ford 9" with 28 or 31 spline axles