Whineing T-Case

[Anita]

The easiest thing to look at first would be the tires: Are they all the same size? If so do all four tires have equal wear on them? And is the air pressure equal in each? By experience I found that whining while coasting (like between 10-30 mph) can be caused by one tire with lower pressure than the others. If all looks clear there then you can look elsewhere for the problem.

[Andrey]

Also ask when they've serviced (changed gear lube) ? If they did not here might be your answer. If you get the car change everything to synthetics - I did and VX became 30% quiter (my subjective perception)... Good luck !