Vibrations ---- Help

I was reading another thread about same problem im having, after about 40mph on full trottle or up hills im gettin big vibrations from the front drive shaft. i removed it and checked the UJ's which are fine. theres play coming from the link into the transfer box.
Is there a bearing that could be gone? Ive attached two pictures.

Any one know if i remove that bolt can i pull out a shaft and replace a bearing perhaps? im hoping that its not a costly problem.

Also its a 200tdi engine from a 94 defender. Does this mean its a Lt77 transfer box?

Thanks!

don't suppose that there's any chance a weight / balance has dropped off your props? Supposed to be a little patch of metal stuck onto it somewhere.

-Pos

Sorted! found the problem did after all turn out to be rear UJ, note to self, turn off handbrake when testing!