Does your car have the NV125 transfer case?
When you say you have no AWD, can you expand on that? Do you have front wheel drive only, rear wheel drive only, no drive at all (car does not move), or something else?
If you have the NV125 (my 2001 3.0i does), that can be thought of as a differential with a 68%/32% torque split rear/front. Nothing but gears and bearings from the wheels to the AT, nothing fancy, easy to understand and hopefully troubleshoot.
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2001 X5 3.0i, 203k miles, AT, owned since 2014
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