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In Indian passenger vehicle Industry, customer’s expectations are becoming more challenging day by day. Gearshift feeling has become most demanding and considered as one of the major area of focus during transmission development. Transmission shifting system helps driver to interface with the vehicle drivetrain along-with other systems. It primarily consists of two systems i.e. Peripheral system and Shift system inside the transmission. Peripheral system includes Gear Shift Lever with knob and shift Cable Assembly. Shift system inside the transmission includes Shift Tower Assembly, Shift Forks and Synchronizer Rings etc. Both the systems play an important role in defining the overall gear shift feeling. Any undesired friction in either of these systems deteriorates gearshift feeling which can cause discomfort to driver while engaging or disengaging the gears.

Manual transmissions dominate the Indian market for their obvious benefit of low cost and higher mechanical efficiency resulting in higher fuel economy. Synchronizer system in manual transmission enables smoother and quieter gear shifting. Synchronizer ring is the key element which provides the necessary frictional torque to synchronize the speed of gear and sleeve for smooth shifting. During vehicle running, synchronizer rings are free to rattle inside the indexing clearance. High engine torsional excitation and low clutch dampening can result into increased fluctuation of the input shaft of transmission. High fluctuation or lower contact area of synchronizer ring can lead to damage on the index area. This damage may cause hard gear shifting and gear shift blockage in case of extreme damage.