Rear noise when turning on slow speed

[johan]

I bought a 1998 JGC limited with 160000km or 100000 miles on the clock a week ago. It have this intermittent problem - Sometimes at pull away, when the car is hot and the front wheels are not straight, I hear this chuncking or clicking noise from the rear wheels - almost as if the brakes are sticking. It goes away at higer speeds. As I said, this is intermittent. Someone suggest it can be the viscous coupler and by changing the fluid, it will be better?? A local dealer here in South Africa think it can be the clutch system in the rear diff???

Any suggestions will be appreciated.

Regards

Johan

	Viscous Coupler The goal of this device is to provide smooth and efficient 4WD operation on dry surfaces--if a differential in speed occurs between the axles, heat buildup in the viscous coupler transfers power to the slower axle, providing some traction in off road conditions.