[C-Mil]

cause ive heard that on some models that the slip joint is lubricated by the txfer case...

[LeftOfCenterXJ]

Yes, you do need to put grease in the grease fitting on the front DS. I would recommend doing so when you grease the rest of the suspension, probably everytime you change the oil.

The rear slip yoke is pretty much maintanence free. It is lubricated by the transfer case.

[Ed Rico]

Originally Posted by BlackCherokee91

cause ive heard that on some models that the slip joint is lubricated by the txfer case...

Rear slip yoke on '96-up XJs is external to the transfer case and never comes in contact with the internal fluid as on '95 and earlier XJs. You need to periodically remove the rear driveshaft and manually lube the splines on the transfer case output shaft, normally hidden beneath the black accordian boot at the front of the rear driveshaft. If you're careful, you can release the rear boot clamp (same style as on front wheel drive CV joint boots) and reassemble it after you're done cleaning and relubing the splines. Otherwise, you can get a new replacement clamp at your local parts store.

-Ed Rico