Question about 1988 Ford F 250
You say the cable is in working order do you mean the outer cable is in good shape or have you pulled the inner cable out to inspect for frayed,twisted,or broken cable,if the inner cable is in good shape and no defects then with the cable in place but not connected to the speedometer head drive the car a little to have someone check to make sure the cable is turning as the vehicle is moving .if not then you may have a bad/damaged speedometer drive gear in the transmission,this is located were the cable attaches to the transmission.remove cable then remove the gear drive assembly from the side of the transmission(be sure the gear comes out with it)inspect the the plastic gear for any damage,inspect the gear inside the transmission that the gear is driven off of,turn the drive shaft making sure the gear turns and there is no damage to the gear as you are turning the drive shaft.if this is all okay then i would say that the speedometer head has a problem and needs to be replaced.
Posted on Mar 28, 2011
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Posted on Jan 02, 2017
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