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Old 07-19-2010, 09:25 PM
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OEM Speedometer Jumping Around

I have a '91 Chevy C1500 truck with a factory speedometer that is jumping around on me. It seems to be okay for the most part as slower speeds, but once I head towards freeway speeds (which can happen in an instant with a 406) the speedometer starts jumping around. Does this sound like a speed sensor problem or am I looking at a faulty speedometer?
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Old 07-20-2010, 07:42 AM
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I would guess that it's the speed sensor. Depending on the transmission, they aren't too expensive to replace. Here's part of the Rock Auto page:http://www.rockauto.com/catalog/raframecatalog.php

"1991 CHEVROLET K1500 PICKUP 5.7L 350cid V8 TBI (K) OHV : Electrical : Speed Sensor Wiki Price
ACDELCO Part # 24203876 More Information About this Part
SENSOR,A/TRNS INPUT SPD w/4-SPD A/TRANS(MT1)"

This is just a sample of about 20 different versions.

Dave W
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Old 07-20-2010, 04:11 PM
406cu.in. of tire smokin' fun
 

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Guess I'll try that. That sensor is probaby as old as the truck anyway.
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