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Speedometer problem

chevy111

1/2 ton status
 Premium
Joined
Oct 1, 2005
Posts
364
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11
Location
Sutter, California
My speedo is about 20 miles an hour slow. What could cause this? I noticed the adapter on the tcase is a little loose. Could that be it? Im thinking of taking it apart and getting it all tightened up.
 
The only thing that will change your speedo making it read incorrectly is a gear or tire size change. The adapter you see is for correcting the speedo after doing either one of the above mentioned changes. If you haven't made any changes and the speedo used to read correctly then the last but more uncommon failure is the speedo itself gone bad.
 
It must be the speedo. The tires are almost stock size. They are 31's. The speedo is atleast 20mph off. I have another gauge cluster coming so maybe that will fix it.
 
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