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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

1981 F100 speedometer problems

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Old Sep 21, 2014 | 12:09 PM
  #1  
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my996duc1
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Question 1981 F100 speedometer problems

Took the gauge cluster out and can spin the back of the speedo.... the needle moves.
Drove truck without gauges and cable does not spin.
Unhooked cable at transmission and cable spins on both ends.
Gear is attached at the end of the cable and everything appears fine.


Feeling with a finger in the transmission, the speedo gear inside spins freely.
Should the speedo gear spin freely with the transmission in gear ??
Any ideas ??


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Old Sep 21, 2014 | 12:45 PM
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Speedo gear should not spin if the truck is sitting still. And surely you aren't under ther with your finger on the gear while it is moving.
 
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Old Sep 21, 2014 | 01:23 PM
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Originally Posted by Gary Lewis
Speedo gear should not spin if the truck is sitting still. And surely you aren't under ther with your finger on the gear while it is moving.


You are correct.... truck not moving.
pulled the cable and felt inside where the transmission gear contacts the cable gear.... gear inside transmission spins freely.






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Old Sep 21, 2014 | 01:44 PM
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Therein lies your problem. If it is a 2wd I'm told you can pull the tailshaft and get to the speedo drive gear. But, I've not done it, so....
 
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Old Sep 22, 2014 | 01:42 PM
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humm... that doesn't sound like a quick and easy fix like what we were hoping for.


Thank you for the info !






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