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where the speedometer cable goes into the transmission under the car, when removed from the trans there is a small gear that gets worn out over time.. that little gear or the entire speedometer cable needs to be replaced. An easy and inexpensive fix. I believe the ABS light is on because the computer needs the speed of the car to make its calculations for braking. As long as the speedometer is not working, it cannot do that. So after the speedometer cable issue is fixed, that issue should be fixed as well.
If the ABS (and likely the traction control) light came on at the same time that the speedometer stopped working, you likely have a faulty wheel speed sensor at the right rear wheel. You can test this by swapping the two rear wheel speed sensors (ABS sensors). If the speedometer then works (but the ABS & Traction control lights stay on), replace the sensor that is now at the left rear (was at the right rear). If no change, you may have a fault in the ABS & Traction control - control unit.
The rear wheel speed sensor is the most common problem on those trucks and will do what you are talking about. It is located at the top of the rear axle in the center. It picks up it's signal from a tone ring on the diff inside! If a tranny input or output sensor is bad then the tranny won't shift properly!
have had simmilar problemn with my 1992 licoln towncar do have a solution however will cost hundreds you have a ABS speed sensor out as u kno the problem is you cannot only replace one because they are wire through the axels you have to replace both meaning either both front or both rear in your case if front driversside is faulty you will need to replace both unhooking will only cause light to permantely stay on one suggestion that may help atleast to get an inspection would be to dissconnect sensors to that paticular wheel shut off engine and restart when light is off dissconnect batter for 5 mins then reconnect tghis will reset computer inside possibly giving you enough time to get an inspection befoere computer resets and abs comes back on however it is not guarented to work depends on severit y of damaged sensor and how quickly you module can reset note that this is a temo fix abd sensor will not prevent any stopping or cause danger to braking system it will infact stil engage possibly not on that wheel but that is the problem with an abs as apposed to just a standard anti lock braking system more sensor to break and cost hundreds
DSC is your dynamic stability control, you probably went over something really hard and caused a fault, this is a normal response. If the fault stays on disconnect the battery and leave for five mins then reconnect, if you still have the same robelem your DSC module is faulty, it is located on the rear axel it is a block with an arm connected to the axel mid way on the axel.
Has nothing to do with yor abs the juddering was probably you driving over something which triggered the fault.
hope this helps
i can answer part of your question. the front wheel speed sensors are for abs and trac control only. these will not affect the speedo your problem is some where else. sorry i have not had this prob yet good luck. you could have to replace the rear wheel speed sensor again. they are not that good. and after market are even worse.