126,000 miles. Automatic. Sometimes when accelerating, i get a nasty vibration in the rear end when the tranny downshifts. Mostly when going up a hill, sometimes when on flats. Also seams to get worse when the engine is running hotter(when a/c is on). Also have a clunking in the rear end when driving at slow speeds in town...again when the tranny is down shifting. Anyone have any thoughts?
Thanks in advance.

 

Anyone have any thoughts?