possible broken/damaged cv?

[89gqpatrol4x4]

went out to lcmp park and had a ball on the weekend but noticed a problem. It happens both in high and low range going down hill only. It happens evry 50mtrs or so. Therefore maybe only once down a hill. The car makes a clunck sound and feels as if it moves forward slightly quicker. Like the feeling you get when the front tyres slips on a rock. It sounds like it's coming from the front right but it might just be my dodgy ears. It is a gq wagon with a front air locker. Someone suggested it may be a cv. How would I check this and is it something you could do yourself? I have basic mechanical knowledge. Any ideas?

[MudRunnerTD]

Do you have the front locker on when it does it does not sound like a CV mate, more likely a uni but if you have the locker turned on then it could be front diff wind up.

[89gqpatrol4x4]

no front locker is out.
excuse my ignorance but by uni you mean universal joint in what?

[nissannewby]

Front drive shaft. It could even be your transfer case the chain could be slipping it might be in need of a new one.