The Muncie 2 & 4-Bolt Optional Shaft Extension is the perfect direct mount for large hydraulic pumps. This extension eliminates the need for driveline or front engine drives, providing reliable and durable performance for hydraulic systems. It is designed to fit with Allison 4000 with a retarder or a rear-mounted cooler. This shaft extension is the perfect solution for those looking for a reliable and durable performance for their hydraulic systems. FleetPride is your First Click in Heavy Duty®.