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Old August 11th, 2012, 02:00 AM   #1
bubbarich1
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Default Speedometer question.

I have an 87 chevy half ton on 33's, so needless to say my speedometer is off. Is there a simple fix to make the speedo show the right speed or will I have to tear into the trans to correct the problem? I like to work on the truck myself but I am not a pro. If this job is better left to a pro, the info would be welcome. Thanks guys.
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Old August 11th, 2012, 02:32 AM   #2
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gears are in your t-case output
http://www.partshp.com/speedometer_gears.htm

halfway down the page there is a chart to figure axle ratio and tire size. You need to see what you have currently, to avoid purchasing unnecessary parts.
http://www.transmissioncenter.net/sp...n_______va.htm

then just scroll down a bit further and buy the parts from PATC.



This is a pretty easy job you can do with very basic hand tools.
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Old August 13th, 2012, 11:31 PM   #3
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Thanks
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Old August 14th, 2012, 09:11 PM   #4
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Quote:
Originally Posted by bubbarich1 View Post
Is there a simple fix to make the speedo show the right speed

Buy a gps speedo they are super easy to install. If you like the old school look of your gauges then just buy a cheap gps that has been made in the last 2 years.

That way when you can change gears and tire sizes without worrying about the speed or odometer being off.

Last edited by cerial; August 14th, 2012 at 09:12 PM. Reason: miles
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Old August 15th, 2012, 07:49 AM   #5
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Quote:
Originally Posted by cerial View Post
Buy a gps speedo they are super easy to install. If you like the old school look of your gauges then just buy a cheap gps that has been made in the last 2 years.

That way when you can change gears and tire sizes without worrying about the speed or odometer being off.
You don't need a GPS one, most electric aftermarket ones do the same. I use VDO electronic ones in my trucks (since I design instrument clusters for VDO)... you screw in an electronic sender in place of the standard mechanical cable on the t-case. Then you push the calibrate button, drive 1 mile, and push it again, and its calibrated. Change your tires or gears, just repeat the process.
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