do a spanner check to make sure it's all tight, the bearings shouldn't have any movement in them.
not sure if the early vitara's have them but inside the hub there is a little roller bearing the the outer stub axle of the CV run on, I had them fail on my silver shorty & it took a fair while for me to work out where the noise was coming from. they're a genuine suzuki part as no one else has a listing for them.
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i do have the part numbers somewhere
