Patent ID: 8857592

Claim:
A method of improving the performance of an OEM automatic transmission, said clutch assembly including an OEM input housing configured to receive an interleaved stack of a first number of friction elements and a first number of steel plates through an open end, and OEM clutch components within said housing comprising a piston acting through an apply-ring and apply-plate to press the interleaved stack against an end-ring, and return springs urging the apply-plate to a default position, said method comprising: removing the OEM clutch components from the OEM input housing; replacing the OEM input housing with a modified input housing having surface around the open end; inserting the OEM piston into the modified input housing; inserting a modified apply-plate and OEM apply ring into the input housing, the modified apply-plate having an annular recessed face configured to cooperate with the OEM apply-ring; inserting the first numbers of friction disks and plural steel plates in an interleaved stack into the modified input housing; inserting at least one additional steel plate into the modified input housing disposed in mating relationship with a terminal one of said first number of friction elements; inserting at least one additional friction element into the modified input housing disposed in mating relationship with said at least one additional steel plate to form in combination with said first number of friction elements and said first number of steel plates an extended interleaved stack, with said at least one additional friction element forming a new terminal friction element; enclosing the open end of the modified input housing with a retaining ring mounted to the receiving surface, the retaining ring having an inner side thereof adapted to directly receive forces applied through the clutch assembly; and inserting a plurality of modified return springs into the modified input housing prior to enclosing the open end, said modified return springs configured with sufficient length to be disposed between said retaining ring and said modified apply-plate to urge the apply-plate to the default position.