help speedo gone crazy

big blue

Founding Member
Jul 23, 2002
lexington, ky
well ok not crazy but it defininately isn't reading right. I was paced by my wife on the highway and at 55 mph the speedo reads at around 51 or 52 and the discrepensy grows form there when the speedo says 65 on the interstate i know i am doing at least 80 because i am passing people right and left. :shrug:

Here are my stats

Stock 1993 mustang lx
auto trans
Stock Rearend ( looks unmolested )
only mod so far is flowmaster mufflers

any and all help appreciated
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