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Brand New Southwest Speed 28 Spline 9" Ford Rear End Mini-Spool (SWS Part # 603-028). Weighs Only 4.26 lbs!!! Mini-Spools Replace The Spur Gears To Lock The Rear End Unfortunately, A Growing Number Of The Mini-Spools On The Market Today Just Won't Hold Up In High Performance Applications. You Will Not Have That Problem With The Southwest Speed Mini-Spools. The Heat-Treated, Forged 8620 Steel Construction Will Give You Years Of Service. For Use With 9" Ford Rear Ends In Circle Track Racing Applications Where Less Rotating Weight Can Be The Key To Victory