Clunk sound in front end

[redbarron1971]

When in 4 wheel drive and driving 55 MPH sometime slower i hear a clunk sound in the front end it is not constant. about every 1/4 mile or less it will pop or bang almost like the hubs are poping out. I thought it might be the front drive shaft u-joints where bad like on my 85 ford bronco II but they are ok could any tell me what the problem might be thanks

[chr97]

My 75 ford did that and it was the hub, You should be able to hear if they are turning smoothly if you put it on a jack stand and manually turn the tires. Mine just rattled. My father inlaws 79 GMC did the same thing.