I fond a strange vibration when I start at a corner. It seem to came from the transmission. I took the jeep to garage. They told me this is the diferential. They need to replace the oil. My jeep had only 35k. The service guy told me that jeep recomend to change the diferential oil every 20K. I never change the differential oil in either of my car. Does it sond normal to you guys.
Thank you
Check your manual. It will tell you when to change the fluids. If you brought it to one of those Quick Oil Change places they often lie about fluid change intervals to make more money.
Not true.
Jeep specify 2 schedules depending on whether you drive it like a normal car (Schedule A) or take it off road a lot, or do predominantely short journeys (Schedule B). Schedule A does not require you to change the diff oil. Schedule B requires it every 6K miles. [source the FSM for the 99 TJ]
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