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This upgraded pump rotor is fully CNC machined to exacting tolerances from heat treated steel billet blanks that will not fracture like the OEM design. The kit includes all new pump vanes, hardened pump vane rings, pump rotor guide, and a pump slide spring which increase oil pressure and volume and reduce oil pressure drop on gear changes. Fits all 4L60E, 4L65E, and 4L70E transmissions. Made in the U.S.A
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