[KiltedBanshees93GT]

I posted previously about a strange noise I've been getting in my car, and it seems to be getting worse. I've noticed in the last couple of days that the car is making a louder whirring/cycling noise coming from the rear end. It is loudest when turning hard right, the harder the louder, with left coming in a close second, and now I can hear it when going straight but it is much fainter.
The sound reminds me of a gear whirring, but it cycles in loudness during the turn about 2 whirr's a second at less than 5mph.
You folks think I should take it into a shop to get it checked? I've never heard this type of noise coming from a rear before (Also never had one go south on me before tho).
Should I be worried?

J