Abstract: A shift rail interlock arrangement for a manual transmission having a pair of outboard shift rails and a center shift rail arranged in a symmetrical manner on a circular arc with the center rail above the outboard rails. A pair of identical Z-shaped shift rail interlocking lugs are arranged in a mirror-image manner with each lug positioned intermediate the center rail and its associated outboard rail. The lugs are adapted for conjoint movement in a transverse vertical plane to insure travel of only one rail at a time during the shifting operation. A U-shaped slot is provided in the transmission case to cooperatively support the Z-shaped lugs such that the lugs are obviated from canting during their transverse reciprocal travel within the slot.

Abstract: A shift rail interlocking lug system for a manual transmission having a pair of outboard shift rails and a center shift rail disposed in a longitudinally extending parallel manner. A pair of identical I-shaped shift rail interlocking lugs are located in a mirror image manner with each lug positioned intermediate the center rail and its associated outboard rail. The lugs are adapted for conjoint movement in a transverse vertical plane to insure travel of only one rail at a time during the shifting operation. Each I-shaped lug is adapted to interengage the center rail and its associated outboard rail in a self-supporting encapsulating manner throughout the shifting sequence.