Truck makes clicking/rattling noise when in 4X4?

I have to use an old '97 Ford Ranger with an auto tranny and auto locking hubs at my workplace. When you turn the electronic switch to 4X4 low or high and accelerate it makes a harsh rattling/clicking noise but the truck will still move. Does this mean the transfer case is shot and I will have to live with 2 wheel drive? Since I sometimes have to drive on grass trails it would be nice to get this thing fixed if it's a simple fix.

If its a ticking sound Ill guess its the front c/v joints that are shot just use 4wd when you have to

The front hubs aren't locking in all the way. Probably a faulty actuator.

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