The CTA Rear Crankshaft Seal R&I Tool Cummins 3.5L, 3.9L, 5.9L, and 6.7L, No. 3880, is designed to remove and install seals with and without wear sleeves such as 3934486, 3926126, and 3925529. The tool services Cummins 3.5L, 3.9L, 5.9L, and 6.7L; 1989-2016 Cummins 4BT 3.9L; B Series 5.9L; ISB 5.9L and 6.7L; QSB 5.9L and 6.7L; and Paccar engines PX-6.