92 Silverado speedo

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jess t

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The speedometer on my 92 Silverado works correctly driving short trips around home, but when I travel out of town for trips that take 45 minutes to a couple hours, it gradually drops down to about 40 mph, even though I'm doing about 70. I understand from researching other posts this may be a faulty stepper motor? How hard are they to obtain and change? jess
 

jess t

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Update! I smoked the converter clutches in my 700R4 (towing an unloaded box trailer in OD)......so.....I pulled it out a have it on the bench to overhaul while it's out for a new converter. I found, after pulling the tailshaft, that the speedo reluctor does not fit tight on the output shaft!?? The shaft measures 1.190, and the reluctor does not have any cracks, but it will easily spin on the shaft. I'm pretty sure it should be a press fit. Anyone else run into this? TIA jess
 

GoToGuy

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If you don't have the factory service manuals , there free to download here, might help, has a lot of answers. Quick search forum for links.
 

jess t

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The answer to my question..... worn out output shaft! Apparently the reluctor spun long enough to wear the shaft a couple thousandths. Replaced it with an unworn (1.192) used piece, problem solved.
 

Dropped88

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That would be the first time I've heard the reluctor spinning on the shaft and wearing it out.

Wonder if a PO damaged it some how I've seen my fair share of why some people need to drop the tools and step back
 
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