I have the same problem on my fornt end and the sound is louder on the right side. As mentioned, the problem is with the upper strut mount. If you replace them with after market strut plates you can fix the problem. Replacing your struts or springs will not. I bought new KYB struts and lowering springs for better handling an appearance. It looks and handles great but the "clunking" noise is still there just as before and it seems to be getting louder. I just can't get myself to pay to fix the strut plates. Somehow I feel like Toyota should pay for it (design flaw). That's why the dealer keeps telling us that IT does not affect safety or handling, its true but it sure is annoying! Big car maker politics.
99 V6, LOWERED, COOL CUSTOM GRILL, TINTED WINDOWS, CUSTOM FRONT BUMPER, WHITE 17" WHEELS, BODY KIT, CLEAR CORNERS, INTAKE WITH K&N.