TRAXXAS 8250 TRX-4 CENTER SWIVEL JOINTS. Half Shafts, Center (Internally Splined, Front (2) & Internally Splined, Rear (2)/ Externally Splined (2)/ Pin Retainer (4)) (Plastic Parts Only) The center half shaft set includes front internally splined halves (2), rear internally splined halves (2), two externally splined halves, and pin retainers (4). Replacement part for these models: TRX-4® Edition 1972 Chevrolet® Blazer® High Trail™ TRX-4® 1979 Chevrolet® Blazer® TRX-4® 1979 Ford® Bronco® TRX-4® Edition Chevrolet® K10 High Trail™ TRX-4® Equipped with Traxx® TRX-4® Ford® Bronco® TRX-4® Edition Ford® F-150® High Trail™ TRX-4® Land Rover® Defender® TRX-4® Sport Edition High Trail™ TRX-4® Sport Unassembled TRX-4® Kit Mercedes-Benz® G 63® AMG 6X6 RC Hauler TRX-6® Ultimate