E4OD 4R100, REMANUFACTURED TORQUE CONVERTER, 2000 STALL, 12.750" DIAMETER, 11.375" BOLT CIRCLE, 4 STUDS, MILLED FLATS HUB, 31 SPLINES, CODES: A, AA, E, F, H, M, O, SS, U *FOR MORE A MORE DETAILED DESCRIPTION, PLEASE VISIT ONE OF OUR PRODUCT PAGES ON YOUR DESIRED SELLING PLATFORM!*