I recently had the back of my car on jackstands and I went underneath checkin the driveshaft bolts/ujoints. I grabbed both tires and with some force was able to turn them in different directions. Is this a sign of the trac lok worn out? Also if I spin the driveshaft there seems to be quite a bit play in the diff.(gears worn?). The rear does whine and it's the worst when cruising in 4th. My car in general just doesn't spin em like it used to and feels sluggish, I'm thinkin I need to have the whole rear looked at and rebuilt. BTW these are stock 3.08 gears, and I have recently topped off the diff fluid.