There may be a squeak or chirp coming from the bushings in the rear axle
assembly when you upshift at high throttle settings.. This usually will
occur (if it occurs) on super and turbo charged Miatas. Try lubing the
bushings with rubber lubricant. Or ignore it as I do.

"Dana H. Myers" > wrote in message
news
> Lanny Chambers wrote:
> > In article >,
> > "Dana H. Myers" > wrote:
> >
> >
> >>Lenny suggests a lubrication point, but that hasn't helped. The chirp
> >>got worse, by quite a bit, after I installed a Sebring-type supercharger
> >>kit at 13k miles.
> >
> >
> > Different chirp, Dana. The other is a tweet-tweet-tweet sound in
> > neutral. Yours is coming from the disk itself, as it slips under load.
> > If your supercharger is making it worse, expect to need a new clutch
> > sooner rather than later. A stronger replacement probably won't make the
> > noise, because it won't slip.
>
> It isn't coming the area of the clutch; it's coming from the area
> of the rear wheels and it sounds like rubber tires squealing.
>
> Dana