Replacement forward drum and method in certain automatic transmissions

摘要

Systems, devices, and methods for a replacement forward drum for Ford's 4R70E/W and 4R75E/W transmissions. In one embodiment, a replacement forward drum is provided that may include a high-strength structure with oil feed passageways configured to provide fluid communication with one of Ford's OE 4R70E/W or 4R75E/W stator tubes.

主权项

1. A replacement forward drum for an original equipment (“OE”) transmission configured for installation with an OE stator tube having a sidewall with an outer surface and a first oil feed plenum formed in the sidewall extending around the outer surface, the forward drum comprising:
a unitary annular body member formed around an axis of rotation comprising
a stator tube portion having an inner wall defining a stator tube bore sized and configured for receipt of the OE stator tube therein, and a second oil feed plenum formed in a direction into and around said inner wall, the second oil feed plenum being positioned to communicate with the first oil feed plenum when the OE stator tube is received in said stator tube bore,a clutch pack portion having a plurality of axial grooves, the axial grooves being configured and dimensioned for engagement with a plurality of tabs formed on clutch pack separator disks; anda piston portion disposed between the stator tube portion and the clutch pack portion, the piston portion defining a piston cavity configured and dimensioned for receipt of a forward piston therein and at least one oil feed hole extending between the second oil feed plenum and the piston cavity;wherein said second oil feed plenum is formed by a circumferential groove in said inner wall.