On the back side of the rear differential, facing the bumper, there is a plastic round plug that is 1.5 to 2 inches in diameter. There is an oil stain coming from this plug running down the differential to its base . I had just noticed in about a week ago. Since I have the need to purchase a couple of things from the dealer I was going to look into replacing this plug. However, in the 2006 service manual there is no picture or discussion regarding this plug. I am stumped. Has anybody else come across this same concern or who has replaced this plug in the past and willing to share its part number? I can only imagine what may occur, if a slow leak is occuring, to the differential if left to be forgotten , Thanks to all who look into this post and whom choose to reply.

Peace,

Scott

Sounds like it's the rubber fill plug to me. Normal to have residue around it, if oil is running down it, must be overfull.

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2006 Black Jeep Liberty CRD Limited
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"IT'S A DIESEL THING, YOU WOULDN'T UNDERSTAND"
Certified Services Auto & Truck Repair

Check the axle vent tube to make sure it isn't plugged

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SOLD 11/21/13 White '06 Jeep KJ CRD<--Way to much $ spent here
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89 W250 5.9L Cummins
97 F350 7.3L PSD
00 Excursion 7.3L PSD
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Thanks for the advice. Picked up new plug but search for vent before install. Thanks.