[Dane GT3]

All

bought a used 2004 GT3 last month.
Car had 12K miles, now about 13,500.

Looks to have original tires but aftermarket (performance friction front rotors) - still have a terrible brake squeal - ordered some parts from Pelican, just haven't had the time to install. Anyhow different question this time.
According to the seller - dealership out of Dallas, the car was not tracked or raced !!

Here is my question:
When backing up and turning at the same time, all at low speed, I hear a klonk, klonk or a noise similar to a 4 wheel drive car when in 4 - low and turning.
I know that the car has limited slip and some noise could be the result of that but the noise i hear, seams almost like a binding cv joint or ring/pinion noise.
Could it be the result of low transaxle fluid level??

Any input or suggestions will be appreciated.