Regardless of the application, outer joints typically
wear faster than inner joints because of the increased
range of operating angles to which they are subjected.
Inner joint angles may change only 10 to 20 degrees as
the suspension travels through jounce and rebound.
Outer joints can undergo changes of up'to 40 degrees in
addition to jounce and rebound as the wheels are steered.
That, combined with more flexing of the outer boots, is
why outer joints have a higher failure rate. On average,