Have Jeep Questions? Ask a Jeep Repair Expert for Answers
Hello. Welcome ot Just Answer. Please allow me to assist you. The best advice I can give you here is to get a better indication of where the noise is coming form exactly. A good mechanic armed with a mechanic's stethoscope will be able to pinpoint this noise when it is raise up on a hoist, in gear, running, in 4WD. However, to answer your question, my initial feeling is no, replacement of the differential may not be the issue. You may have differential 'carrier bearings' that are worn or faulty, or a pinion bearing that is worn or faulty. If the mechanic checks the noise, and it is not prominent at the u-joint yoke area on the differential, and, the noise is louder on the side of the diff case, you probably have carrier bearing issues. This is easily rectified by pulling the differential unit out ans replacing the carrier bearings. If you replace the diff, and re-use the carrier bearings, you may still have the same noise. Faulty or worn carrier bearings are easily seen; and can he heard if you remove them and spin them by hand. If they make noises whilst spinning, they are bad. Good carrier bearings are almost silent when they spin.
Please confirm that you have received my input. If you have any questions, please feel free to ask. Thanks.