Setting Pinion Angle Correctly
Pinion angle is one of the more important measurements on a lifted vehicle. The wrong angle can lead to vibration and premature failure of U-joints, drive shafts, pinion bearings and even transfer case output bearings.
Types of drive shafts
There are two common types of drive shafts used in 4wd vehicles, standard with one U-joint at each end and CV drive shafts. CV stands for Constant Velocity. CV drive shafts are so named because they have a constant velocity joint at one end, the other end has a single U-joint.
There are two types of constant velocity joints, the double cardan and the caged ball type. The double cardan type is the CV joint with the two U-joints at one end that is so popular with 4 wheelers. The caged ball type is similar to a CV joint in a front wheel drive car or a Birfield from a Samuri or Toyota front axle. The caged ball type CV joint is notoriously weak and is it fortunate that these drive shafts can be found in only a few four wheel vehicles including some Bronco II's and a few early XJ Cherokees. Most who find caged ball type CV drive shafts on their vehicles quickly upgrade to a standard double cardan type CV drive shaft.