The adjustable pinion angle adaptor, machined out of chromoly with a 1 ½ heim joint. The unit is completely bolt in. This provides for the fastest and easiest way to adjust your pinion angle.
Pinion angle is one of the more important measurements on a lifted vehicle. The wrong angle can lead to drive line vibration and premature failure of U-joints, drive shafts, pinion bearings and even transfer case output bearings.
What happens when the pinion angle is off?
As mentioned above, improperly set pinion angle causes vibration that can lead to early parts failure. The vibration results from unequal velocities at the opposite ends of the drive shaft. When a U-joint is run at an angle the drive shaft will actually speed up and slow down twice during each revolution, due to the changing angular velocity of the U-joint ends. The U-joint caps connected to the pinion yoke spin around the pinion without moving forwards or backwards, when viewed from the side.
The U-joint caps on the drive shaft move forwards and back quite a bit when viewed from the side, causing a change in the speed that the drive shaft rotates.
There will be no vibration if the angles are the same at both ends of the drive shaft because both ends will speed up and slow down at the same time and in the same amounts. If the angles are off the U-joints will still cause the speed to change at the same time (unless the drive shaft is twisted) but in different amounts, causing vibration. Keeping the pinion parallel with the output of the transfer case will keep the angles the same, avoiding vibrations. Patent Pending
FITS:
Defender 90
Discovery I
Range Rover Classic
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