My clunk was from the front, and went away when this was replaced. The supporting joint takes the force of the wheels and transfers it to the frame of the car in the front.
The clunking in the rear going away with the rear shock replacement could be the sway bar links. I can certainly understand your mechanic replacing those when the shocks in the rear are replaced. He would be right there anyway, and the parts are not too expensive, (especially when compared to the price of the shocks!)
Also to note: The driver's side bushing was much worse, as I had a power steering leak last year. The rubber bushing was still oily from this, and very deteriorated. I am sure this contributed to the bushing's failure.
[Edited by JohninFLa on 02-12-2001 at 08:20 PM]
1989 560SEL (172k)
1989 325IC (122K)
2004 Suzuki Volusia LE (3500 miles)
2005 Yamaha Road Star (20 K miles)