Hi all,I have this lapping sound from underneath my 1988 fourtrak.it sounds like something caught up in the propshaft, but this is not the case! its their freewheeling downhill or driving uphill and increases in noise according to speed. I have replaced the hardy splicer joint on the transfer box end of the front prop which also has up and down movement on the sliding spline, i have cleaned all of this up and gave it a thorough greasing but to no avail. Has anyone else encounterd this problem? if so did you find the answer? Cheers Phil.