The CV axles are always connected to a transaxle and/or a differential, giving power to the drive wheels. CV joints even transfer power while absorbing the up and down motion that naturally happens with the suspension components and tires rolling on bumpy roads with debris, and the left and right motion of front-wheel drive and all-wheel drive steering.įront-wheel drive vehicles have two CV axles in the front, rear-wheel drive vehicles with independent rear suspension have two CV axles in the rear, and all-wheel drive vehicles have four CV Axles connected to the drive wheels. Because CV joints are equipped with roller bearings, they are able to continuously transfer a constant velocity from the transaxle or differential, to the CV axle half shafts. There are several intricate parts that make a CV joint work, but the two most important parts – and the parts most likely to need service – are the cage and bearings that give the joint its fluid flexibility, and the CV boot that protects the bearings.Ĭonstant velocity joints are special – and especially important to front-wheel and all-wheel vehicles – because of the flexibility their ball-bearing construction lends to the vehicle’s drive axles. CV joints (constant velocity joints) are flexible joints that evenly transfer power from a vehicle’s transaxle or differential to the CV axle half shafts and onto the wheels.

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