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Old 02-21-2017, 02:48 PM   #251
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Join Date: Apr 2011
Location: New Zealand
Posts: 433
Default Re: F150 tranny with overdrive

Originally Posted by harleytoprock View Post
Speedo won't need calibration with the F150 overdrive because the speedometer is driven off the drive shaft. A change in rear end ratio would require a calibration change.
It's interesting that because the gearbox has an electronic take-off for the speedo, I was told that an expensive solution was required.
However a Ford Falcon speedo cable fitted perfectly.
Also, with the 42% overdrive the speedo reads 75mph when the car is doing 62mph (100kph in NZ)
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