Speedometer Reading Bad
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Senior User
Joined: Feb 2013
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From: Southern Cal Desert
Speedometer Reading Bad
I had my C-6 transmission rebuilt. All shifts great after my shift kit. My question is now it seems that my speedometer is off. I think maybe even 10 miles faster than I am going, plus the needle is now bumping. Does anyone here know what to do? It never did this before. 
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Senior User
Joined: Feb 2013
Posts: 180
Likes: 0
From: Southern Cal Desert
Same transmission. Original in the truck had never been rebuilt. So you mean just disconnect from both ends and then reconnect?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
Yup... the cable could also be kinked.
Posting Guru
Joined: Oct 2000
Posts: 1,355
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From: Western NC
One thing I did to check the accuracy of my speedo was to download a speedometer app on my phone and compare the two. The app works off of GPS. I discovered that I am about 5mph heavy at ~45mph, and about 10mph heavy at ~70mph. Eventually I may try to change out the gear....
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Senior User
Joined: Feb 2013
Posts: 180
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From: Southern Cal Desert
One thing I did to check the accuracy of my speedo was to download a speedometer app on my phone and compare the two. The app works off of GPS. I discovered that I am about 5mph heavy at ~45mph, and about 10mph heavy at ~70mph. Eventually I may try to change out the gear....
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Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
2X John. My 1st thought was the tranny shop mixed up your output shaft (with the speedo gear attached) with another. To slow down the speedo add more teeth to the speedo driven gear on the end of the cable. Each tooth is 3-5 MPH.
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