Sorry its a 87 yj w/ Howell fi an Hei dist auto tranny (wife cant drive stick) its got a 13/4" shackle lift american racing rims with 31" tires ,another thing I was thinking about was I have the elec. fuel pump bracketed to the underside of the tranny skid plate I wonder if that is vibrating ,gonna put some pipe insulation around it to test that theory,the noise seems to be coming from the center of the jeep its hard to tell cause it only happens on the hiway all thoughts are appreciated old stories or this freak thing happened to me because its now the 2nd set of ujoints in that many weekends Thanks all