Outer Limits 4x4 Board

I went bush during the long weekend to do some hunting and fishing . I had to use 4wd drive in certain spots. Now when I was going uphill engaged in 4wd there was a loud clicking sound coming from the front left hand side wheel. It does not make a sound when driving normally. I have not had time to have a look under the car as I'm back at work. Can someone give an idea or help. The car is a 1990 toyota hilux xtracab rn106 petrol.
thanks
Toy090

It sounds like a shot CV joint.

x2

thanks guys

took mine out on the weekend and it was doing the same thing same side as well nice to have an idea on what it might be