How many miles are on the vehicle? There are a couple of methods for testing the VC. If I can remember correctly and someone else chime in if I get it wrong.
Go out and drive around in a few circles to really windup the VC. If it is working normally, it will dissipate the front to rear differential in speed if not it will hold some of the energy in the drivelines. Park your car in the garage and jack up one of the rear wheels. If there is still pressure in the driveline then the wheel will rotate as soon as it leaves the ground. If it is locked up the wheel will roate something like 1/4 to 1/2 of a turn by itself.
Then put some jack stands under the axle and see if you can physicaly turn that one raised wheel by yourself. I had to put a bit of force on it but mine will turn just fine. I would grab the top of the wheel and lean into it to turn it. It will turn very slowly. When you are manually turning the one wheel while it is off the ground is actually turnning the VC.
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