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Gear box main drive retainer (known as Chillam in India) is a device used to retain a shaft inside the gearbox. The shaft which it holds is the main Torque transmission shaft and supplies power to move the vehicle.
Structural features
A straight pipe connected to a hub which is hollow from underneath and also has various holes for bolting arrangement which are used to fix it with gear box.
References
Gearbox main drive retainer Wikipedia(Text) CC BY-SA