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Yes the center support bearing can be replaced , however there are some special tools involved to do it. There also has been a service bulletin on them for some vehicles.
File in Section: 04 - Driveline Axle
Bulletin No.: 04-04-17-002
Issue Date: August, 2004
Attention: Fixed Operations Manager and Technician
Some customers may comment on a vibration that can be felt only in the seatback or armrest.
This condition may be caused by driveline pulsations from the all wheel drive system that is transmitted through the propeller shaft center support bearing and into the seat assembly.
Verify the customer concern and, if necessary, replace the propeller shaft center support bearing. Refer to the service procedure in this bulletin.
REMOVAL NOTICE: Never clamp propeller shaft tubing in a vise. Clamping propeller shaft tubing in a vise could dent or deform the tube, causing an imbalance or unsafe condition. Always clamp on one end of the yokes and support the shaft horizontally.IMPORTANT: Prior to disassembly, mark the positions of the driveshaft components relative to the driveshaft tube. All components must be reassembled in the same relationship to maintain proper balance.