A pack that slips under throttle is telling you the friction material is done, whatever the fluid looks like on the stick.ALLISON mt640 series FRICTION CLUTCH PACK. This pack restores the torque capacity the unit had when it left the line.The facing holds up to repeated apply cycles without separating, which is the failure mode that sends a rebuild back apart. Shipping weight is 3 lb.The parts list below is exactly what ships. Compare it against your teardown before ordering.REMCO has supplied automatic transmission parts since 1991, and every order ships with its part listing so the receiving technician can check what arrived against what was ordered. Friction Clutch Plate Set for MT640 - replacement component designed for proper fit and function Designed to support proper clutch apply, holding capacity and shift feel during clutch pack service Package Includes: one friction clutch plate set as described, supplied loose for clutch pack service High energy friction material bonded to a steel core - designed for dependable service in the intended application. Ships at 3.00 lb, 16x16x2 in Intended for technicians restoring holding capacity. Soak the plates in the specified fluid before assembly and set to the service manual range What's in the box1 x Friction Clutch Pack, ALLISON mt640 Series Automatic