74584BK - 700R4 4L60E, REAR PLANETARY KIT, 4 GEAR, PLANET SUN GEAR, RING GEAR. 74584BK - 700R4 4L60E, REAR PLANETARY KIT, 4 GEAR, PLANET SUN GEAR, RING GEAR. GOOD USED COMMON BRANDS FOR THIS PART INCLUDE: BUICK, PONTIAC, OLDSMOBILE, HUMMER, CHEVROLET, GMC & GEO. BE SURE TO CHECK FITMENT PRIOR TO PURCHASING.