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1990 Ford F-150 Question: why does my speedometer jump when i do 50mph after replacing the whole rearend

 

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pupdixie, West Monroe, NY, December 01, 2012, 10:56
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changed out the whole rear end and now the speedomoter jumps when i get to 50mph.It jumps to 100 then back down etc.

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  • Answer #1

    December 02, 2012, 09:47
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  • Answer #2

    March 02, 2015, 16:31
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    check the differential to see if you have a speed sensor near the left rear wheel which might not be working correctly with the computer . The one you put in might be bad.

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