The Muncie 48TK5546 is a welded extension shaft installation kit for the Muncie EX Drive system, specifically matched to Allison 4000 series transmissions equipped with a retarder. The EX Drive eliminates traditional driveline installations by allowing large gear or piston pumps to direct-mount to the PTO. This kit is part of the EX Drive family, which features a wet spline design for extended spline durability and a steel housing system. The EX Drive is available for the A20, A30, A40, A50, and CS40/41 PTO families, with SAE B, BB, and C output configurations as well as DIN 5462. Call us to confirm proper fitment for your specific transmission and PTO combination.FeaturesSpecifically listed for Allison 4000 series transmissions with retarderPart of Muncie’s EX Drive shaft extension systemWet spline design for improved spline durability and service lifeDirect-mount capability for large gear or piston pumps eliminates driveline installationSteel housing systemCompatible with A20, A30, A40, A50, and CS40/41 PTO families (SAE B, BB, C, and DIN 5462 outputs)