56580BK - 5R55E, OVERDRIVE PLANETARY PLANET KIT, WITH DRUM, SUN GEAR, FORD. 56580BK - 5R55E, OVERDRIVE PLANETARY PLANET KIT, WITH DRUM, SUN GEAR, FORD. GOOD USED COMMON BRANDS FOR THIS PART INCLUDE: FORD, MAZDA & MERCURY. BE SURE TO CHECK FITMENT PRIOR TO PURCHASING.