Q: 1999 Ford F150 is over reving before it shifts gears

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My truck keeps over reving before it shifts ive replaced both speed sensors one one the tail of the transmission and the one on the rear differential. Im still having the same problems does the codes need to be cleared or reprogrammed in order for the sensors to work

The function of the vehicle speed sensors on the vehicle are fairly simply and do not always need reprogramming, generally. If the engine has to rev very high before the shift, there many be a fault within the transmission assembly. Check all of the fluid levels and make sure the transmission is full of fluid first. Have an experienced technician drive the vehicle and inspect the drivetrain for problems to further diagnose your shifting issue. Good luck.

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