Hi my 1995 fourtrak started making an awful metallic grinding noise from the front end. only twice in 19 miles. the left freewheeling hub was full of chewed up spring housing and the big coil spring was loose inside. i replaced the hub but while driving every thing is ok for a while then i get a grinding noisebetween front wheels then a bang as if something (splines???)are engaging then are getting fired away from each other.the noise is similar to::imagine a brake pad come adrift,a grinding followed by a bang as the pad is flung out.(its not the pads).please help!!!!