Cat Reman final drives such as part # 20R8557 designed to withstand the forces of high torque and impact loads, and to work as a system to deliver smooth, reliable operation. Final drives transfer power from the engine to the ground.Attributes:• Cat Reman UTN final drives are new final drives which provide new performance and reliability at fraction-of-new costs with return of a qualifying core.• Cat Reman UTN final drives are covered with a same-as-new, 12-month Caterpillar Limited Warranty 1 against Caterpillar defects in material and/or workmanship.• Cat Reman offers drop-in solution.1 Warranty can vary by model and application; limitations apply. For complete details about the applicable Caterpillar Limited Warranty, contact an authorized Cat dealer.