Abstract: A multiple speed ratio manual power transmission shifting mechanism and interlock for an automotive vehicle comprising primary torque delivery gears and a cluster gear assembly having gear elements engageable with each of the main torque delivery gears; two double-acting and one single-acting synchronizer clutch mechanisms for selectively actuating the five primary torque delivery gears a single shift rail and reverse relay assembly for actuating the synchronizer clutch mechanism, a reverse idler shiftable to a driving position or to an inoperative position by the action of a first selector pin mounted on the shift rail that selectively engages either of the double acting synchronizer clutch mechanisms or the reverse idler relay, and an interlock cooperating with the selector pin to block axial movement of the unselecting actuator mechanisms.

Abstract: A multiple ratio manual power transmission mechanism for an automotive vehicle comprising main torque delivery gears and a cluster gear assembly having gear elements engageable with each of the main torque delivery gears, a pair of double acting synchronizer clutch mechanisms for selectively actuating four of said main torque delivery gears to establish two underdrive ratios, a direct-drive ratio and an overdrive ratio, and a single shift rail and shift lever assembly for actuating said synchronizer clutch mechanisms including a first motion reversing lever assembly establishing a connection between the single shift rail and the synchronizer clutch mechanism for third and fourth ratio changes and another lever assembly for reversing the motion imparted to a reverse drive pinion by the single shift rail, the reverse drive pinion being shiftable to a driving position or to an inoperative position and the synchronizer clutch mechanism for the first and second speed ratio changes including an integral main drive