You will have a cv joint for each wheel. So if you have an all-wheel drive vehicle you will have 8 cv joints. CV joints are situated at both ends of the drive shafts. An inner CV joint connects the drive shaft to the transmission. An outer CV joint connects the drive shaft to the wheel. They are designed to minimise vibration and wear.
On front-wheel-drive cars, ball-type CV joints are used on the outer shaft of the drivetrain. Tripod types are used on the inner side.
A CV joint is packed with special grease and sealed by the protective boot. If the boot is damaged, the grease leaks. This reduces lubrication, causing the CV to wear faster. It may also allow dirt and moisture to creep into the CV causing additional wear.
Usually, the outer CV boots are the first to go – they endure more stress than the inner boots. Once the CV boot is cracked or damaged, grease will begin to leak. The CV joint grease isn’t the same as bearing or chassis grease. The grease is usually a green to blackish colour and is easy to spot.
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