Sway bar Linkage. They go bad after so many miles. I need to replace one of my front ones as well. Try to isolate which linkage it is by listening closely. I would strongly suggest you just replace both of them.
98 Corolla LE 1.8L DOHC 1ZZFE
TEIN H.Tech Springs
Tokico HP series Struts
Short ram air intake
Tsudo Axel Back Exhaust
... if a jelly fish stung me.. would you pee on the wound?