1995 Ford F350 speedometer stopped working

1995 FORD F-350
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GARYT_6
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Transmission problem
1995 Ford F350 V8 Automatic 186000 miles

Speedometer stopped working and the truck is shifting back and forth from second to third until I get to about 50 miles per hour. Prevously the overdrive light has been flashing on and off once in a while but works fine once I shut the engine down and restart the truck. Also have a recall to replace speed control deactivation device.
I replaced rear speed sensor in rear and has not fixed speedometer problem. Whats next to check. Mechanic wanted to rip dash apart to see if there was a bad wire.
Sep 18, 2010 at 11:28 AM
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BILLYMAC
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have the recal done this could be the whole prob
Sep 19, 2010 at 9:30 AM