What happens is the fluid inside the transfer case wears out and allows the clutches to not lubricate as needed which causes the car to vibrate as you have described. I would do a fluid change, but you need to use the BWM fluid, it might be expensive, but it is worth it. I just went through this problem in an AWD Mercedes Benz, $70 a quart but it worked.
Transfer box
Capacity. 0.44 liters
Transmission oil must flow/drip gently out of the oil filler opening. If necessary, pour in oil to lower edge of filler screw opening.
Note: Only change oil when transfer box is at normal operating temperature. Check out the images (below). Please let us know what happens.
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Wednesday, January 15th, 2025 AT 11:35 AM