Have you checked the condition of the speedo gear (driven)? If you have 3:73 or "lower" gears, changing the drive gear in the transmission is only way to get accurate speedo measurements and prevent your gear form getting chewed up.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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