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
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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