That was actually one of the 3 I took it to. We have an extremely well respected transmission shop in the area. They couldn't figure it out but said "it will be expensive but the Ford dealership will have all the diagnostics to figure it out" So the Ford dealer was another one of the 3. I should add my anti-lock brake light was on too. They told me I needed to replace the wheel sensors to the tune of about $2,000 (so I replaced them myself with OEM for much less) This did fix my anti-lock light but not my speedometer
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