[Nobody]

Yep, thats one think it could be. But as I had my engine rebuild my mechanic carefully checke both axles, on one there was demaged booth and was replaced but as he told both are in good shape. As this is realy problem find out from where the sound exactly goes (I can not swear it really goes from front, mechanic says from prop. shaft...rear prop. shaft bearings?) I will let them to thorougly test it next week. As it occures only sometimes I gues it is not axle as I remember with my other old cars I had it was doing all the time when slowly turning/parking and it was compleetly different noise. My noise is someting like knocking with middle-size hammer into axle or prop. shaft.
My candidates are CV joints or rear bearing on the prop. shaft at the rear diff. I am getting curious...
Petr