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Speedometer is off, causes?


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1990 3/4 ton 4 wheel drive with an automatic transmission. I have stock 8-bolt steel rims and tires, the tires ...


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Old 12-16-2014, 10:02 PM   #1 (permalink)
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Location: Kanabec County Minnesota
Name: Steve
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Ram Year: 1990
Engine: 318ci V8
Default Speedometer is off, causes?
1990 3/4 ton 4 wheel drive with an automatic transmission.

I have stock 8-bolt steel rims and tires, the tires are the same size as indicated on the door jamb sticker.

The speedometer reads 5mph slower than actual speed.

While driving 55mph using the speedometer my GPS indicates I am actually traveling at 50mph.

Any thoughts on what needs to be done to make this accurate?

Thanks for any help you throw my way.

Steve


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Old 12-17-2014, 07:27 PM   #2 (permalink)
 
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is it 5mph off all the way from 0 up? mine is the same way. no one seemed to really be able to give me an answer. since it will prevent people from speeding in my vehicle i look at it as a good thing.


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Old 12-24-2014, 05:12 PM   #3 (permalink)
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Yep, whole way up.

Thanks for chiming in and letting me know you have a similar issue and no one knew what the cause was.
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