Why is my 4wd clunking?

Forum: 

Hi all, just having a moment with my new sportrak. I have no trouble going into 4WD but when I come out of it and reverse the 10 feet or so you are supposed to when coming out to disengage the auto locking hubs the truck goes "clunk clunk clunk" and then when pulling away in 2wd going slowly it also clunks. And then when I reverse in 2WD it clunks regardless of whether I have changed into 4WD or not. Not sure if it does when im going at speed because the engine is drowning the noise out but I can feel them when going very slow and not when going fast so I guess it stops.

Is this normal? Is there something wrong? Any help would be greatly appreciated, for now I am trying to do as little reversing as possible.

Cheers!