correcting speedometer after gear change ford van

how do ya do it?

i had my van swapped from 3.55's to 4.10's, and added a limited slip, the speedo is wildly off at highway speed.

i took it to ford and they said "ford won't authorize them to change those parameters"

******?

any suggestions.

its a 2006, e150, 4.6L v8
 

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