1988 Ranger, 2.9, 5 speed, 2wd, 7.5, 3.42:1, 190K or 290K on the odo.
I've been hearing this rattling, sometimes kind of a metallic ping, from the rear the last week.
I thought it was probably the universal joints, didn't do it often, only under load between 1500-1900RPM roughly in second...