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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Socal_GMC on September 29, 2009, 11:23:38 pm

Title: MY speedometer is off
Post by: Socal_GMC on September 29, 2009, 11:23:38 pm

My speedometer is off by 10mph. It reads to fast and has only happened since i replaced my trans. I have a 3/4 Gmc high sierra 25 with stock gearing with 33 inch tires. How can i fix this?

Title: Re: MY speedometer is off
Post by: Lt.Del on September 30, 2009, 07:27:52 am

re calibration.

go to nearly any shop and they can calibrate it for you....all it takes is to pull the speedo cable off the tail of the tranny and put a new plastic gear in it after they calculate which gear to use.

Call around to different shops and they'll tell you who can do it.  It'll cost about $40 or so.

Title: Re: MY speedometer is off
Post by: Captkaos on September 30, 2009, 10:43:57 am

Read this:
http://www.73-87.com/7387garage/drivetrain/speedo.htm

Title: Re: MY speedometer is off
Post by: murraygmc on September 30, 2009, 10:54:13 am

good info!