Definently spindle bushings.. won't really hurt anything if you don't change them, you will just get the noise if you go over like 10mph with the hub locked.

Pretty sure you can only get them from the dealer, and were pretty expensive for what they are.. (I recall either $40 or $80 each... maybe that was $80 for the pair).

To replace them you gotta pull the spindle off (undo ball joints and all) and have the brass bushing pressed out/new one pressed in.

I just sorta dealt with mine as I never really had to go fast with the hubs locked..

-Scerb

http://www.scerbfab.com/carb_faq.html