Why!

67Dart440GT said

Not true. Lot's of Lx's cars and GT's came with a 140 mph speedo. 87-88 5.0's had the 85mph speedo, in 88 from October to the end of 89 the 140 mph speedo was used. A "Special Service" vehicle had a special speedo that was marked "Certified Calibration" and was a 160mph speedo.

You could even get the 140 speedo from 85-88 but was clearly marked "Motorsport"

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I stand corrected . Thanks for the specific info :thumblef: .

It's ostensibly been a number of years since I've paid close attention to Mustangs .
I knew about the Certified Calibration deal , but I didn't realise that it went to 160 MPH (!) .

Not to rail road here ...
There used to be a hatchback '82 Mustang "Special Service" ex-CHP unit in the town where I grew up .
I though that the hatchback body style was odd , even back in '86 . From what I understand , there were but a tiny handful of the H.B. bodies made for CHP use ; something like 5 - 10 being made :shock:. It was owned by a college kid ; I haven't seen the car in over 20 years .