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Hello. So I have a 95 f150 with 4r70w. I recently replaced the sensor in the rear and the transmission. Since I've done that the speedometer is bouncing bad never had before. Hard shift from 1-2 is gone. So I put the Old one back in the transmission same. I have to see if I can find the old one on the back diff. What one actually controls the Speedo?
Not all
The 4x4s still have a VSS in the transfer case (up to 97 at least)
The input and output shaft sensors in the trans (like rla2005 said), are just for the trans
Check the plug (connector on that rear axle sensor if a 4x2) for your problem
Check for hair on that magnetic rear axle sensor (excess metal filings)