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Put in new front wheel abs sensor and now speedo is off. Shows speed as slower real 70 = 50 I replace the right front
 

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Was it a cheap Ebay or Amazon sensor?
 

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I suspect a poorly calibrated sensor.
 

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Something else is wrong. The front ABS sensors aren't used for the speedo, although everything goes thru the ABS module.
 

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Probably the vss sensor on the rear differential is bad.
 

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Put in new front wheel abs sensor and now speedo is off. Shows speed as slower real 70 = 50 I replace the right front
It would be helpful to know the model and year of the truck we are talking about here. There are differences in system components and operation between 1999 and 2007.
 
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