Constant Velocity (CV) joints are used to apply power from the final drive to the wheels. Without these we wouldn't be able to allow for the vertical and lateral movement of the wheels. Cv's are comprised of two races (inner and outer) that are connected via ball bearing held in a cage. They are quite long lasting if correctly lubricated.
Clutches transfer the power from the flywheel (Engine) to the input shaft (Gearbox) in a manual setup. The two main parts in a clutch are the pressure plate and the clutch plate. A thrust bearing applies load from the slave cylinder onto the pressure plate. When the bearing is not engaged with the pressure plate, the pressure plat eis clamping the clutch plate (Friction plate) onto the flywheel. When you push the clutch in the pressure is released from the clutch plate and allowed to spin freely from the flywheel. It is very important to align clutches properly and to machine the flywheel when installing clutches. If the flywheel isnt flat the clutch will have unbalanced wear and will wear much quicker. When you bolt up the clutch to the flywheel ensure the plate is aligned to the flywheel (spiget bearing). This ensure the gearbox will slide in much easier.
Drive Shafts transfer the drive from the rear of the gearbox to the differential in a RWD setup. The are generally made of one or two shafts that are connected by Universal Joints. They are generally pretty full proof unless you have a imbalance or worn out UJ. To rectify a imbalance take a runout test of the shaft at the front middle and rear. Add a hose clip to the shaft to counteract the imbalance of the shaft. It may take a number of attempts to get it spot on.
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