Abstract: A modified sprag clutch, which can freewheel in both directions until its locking function is employed at which time it will lock in one direction and freewheel in the other, or lock in both directions depending on the placement of the sprag elements, is described. Among other applications, the present modified sprag clutch permits conventional clutch packs and sprag clutches currently employed in automotive transmissions to be retrofitted to eliminate the high-wear friction discs, and to replace conventional one-way sprag clutches. Transmissions may also be designed with the present modified sprag clutches as original equipment.