It sounds like the same noise that i had coming from my 98 svt, i had both hub bearings replaced, cost was $500 but had the warranty.

98.5 CSVT, 21%Tint, Helo Lotus 18's chrome, Alpine stereo, MTX amp-2 12"subs, B+M shortshifter,Chip, MAF,Kurtz- Rev induction. More mods to come soon...