transmission question

Old 06-17-13, 07:20 AM
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transmission question

I recently got my transmission replaced in my 1999 chevy express van. When I got it back from the mechanic I noticed the speedometer would rise drastically and show 60 mph even if im only going around 20 mph. Once I took it on the highway it would tap out after around 50 mph, meaning it wouldnt accelerate anymore and would almost seem like its down shifting. I brought it back to the mechanic, but he seems a bit clueless. Could the governor be causing this issue ? I just want to be armed with as much info as possible to share with the mechanic. thanks.
Old 06-19-13, 03:35 PM
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If you have to provide info for your "mechanic" you have made a bad choice. No the governor would not do this. I think that is an electronic spedo and if it worked before it should work now if it hasn't been damaged.
Old 06-19-13, 06:22 PM
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There is a reluctor rotor on the output shaft of the transmission. It looks like a gear with magnetic tips and those tips pass by a sensor. If that rotor is loose then that will cause false/incorrect readings.

The speed sensor can easily be removed to see if the rotor is loose.

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