I have a 92 GMC Suburban. When I am driving I hear a slight rythmic clunking noise. It only does it when the vehicle is in gear and moving. I have shifted into neutral while driving and the noise goes away. I can't pinpoint any area where it is coming from. I checked underneath for sloppy ujoints..they seem to be fine. Does anybody have a suggestion as to where I should start? Any help would be appreciated.
Thanks, Dave