Quote:
Originally Posted by t walgamuth
If that year has a cable the cable going bad will often screetch. If it is an electronic speedo well, never mind. 
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Yes, it does have the cable. My guess at this point is the cable core is spinning and the gears in the dash odo are stripped.
However, the PO said the odo hasn't worked in many years, so it is strange that all of a sudden, it started grinding gears.
Maybe he never drove it 85 mph?