I replaced the factory rear joint at 45K with a 351. The 351 got replaced (under warranty I might add) when the center bearing/joint went bye-bye. Both those OEM joints are still in there at 170K. I think the dealer mech was a lot more liberal with the grease than the fatory robot. Although the front axle joints have been replaced twice, once under warranty and once outta pocket. Weird.I'm guessing they didn't get much (if any) grease at the factory.![]()