Has it been common to have a clunky noisy backend? Sounds like a loose sloppy brake drum, third member or a spare tire swinging around. Sometimes think the blinking wheel is gonna fall off, as if loose lug nuts. Really gets your attention at times, idle, slow speeds, backing while turning. Cant seem to make it happen, some what random. Have some Drive line, U-JOINT slap on down shifts common also.
Noise started around 6000 mile. Seems to be progressing with time, now 24600.