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Q: why does my speedometer jump when i do 50mph after replacing the whole rearend

on 1990 Ford F-150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
changed out the whole rear end and now the speedomoter jumps when i get to 50mph.It jumps to 100 then back down etc.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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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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