This will cover the instructions on how to replace the Speed Sensor/ABS Sensor located on the top of the rear differential. Most common side effect of no Speedometer and ABS illuminated light in the instrument cluster on the dash board. This is a very easy repair.
Disconnect the upper electrical harness if the new sensor comes with a new extension. If the sensor did not come with on (as mine did) then disconnect the harness at the sensor.
2. Using a 1/2" deep socket remove the nut holding the sensor in.
3. Next pull out the emergency brake cable clasp and brake line clasp out of the sensor cover. These are tabbed so grasp the back side of them and pull up slightly then pull the front side out. Tip the clasps out of the way (straight up).
4. Place a 9/16" deep socket down the bolt shaft to contact the 2 sided bolt nut at the bottom. Remove this bolt.
5. Pull the sensor cover off the sensor. On the front of the sensor there is a little tab so pull slightly while removing.
6. Clean loose dirt and rust off area before removing the sensor so nothing falls into the differential contaminating the fluid.
7. Twist the sensor and then wiggle it back and forth while pulling it straight up.
Now it's reinstall time. Remember to lubricate the seal on the new sensor with fresh gear oil and lubricate the whole in the top of the differential before installation.
Installation is in reverse order and just snug the bolt to about 35 lbs and nut to about 25 lbs.
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Last edited by hydrashocker; 11-10-2009 at 12:47 PM..
Just got my Durango from the shop yesterday- they said it needs a new ABS sensor and want 200bucks to replace- diagnosis was 125- so that would take it up to 325 total- I said no- glad I found this thread!! Thnx again Hydrashocker!
I'm confused as well. $125 for diagnosis is double what the cost is in my neck of the woods. The sensor is only $30 or so and labor is only about an hour. It seems to me like they were going to charge wheresmacgyver? double what it should really cost.
I have a 2001 4.7 Durango that suffered from intermittent PB & ABS lights for quite some time. Took it to Brakes plus and they diagnosed it as the ABS computer, which is apparently in short supply and very spendy (> $1,000). Well, the internet does provide good information from time to time as this thread demonstrates. Replacing the rear speed sensor worked for me. Replaced it about a 1 - 1/2 weeks ago. Went on a 2,100 mile road trip from the Denver area to Phoenix and back. No problems with the intermittent lights the enitre time. Thanks for the pictures as they really helped!
However, discovered a small leak from the rear diff speed sensor mount after getting back. Went underneath yesterday to tighten it up and ended up shearing the retention bolt at the base. BE VERY VERY CAREFUL WHEN TIGHTENING THE BOLT!!! My guess is after 10 years of use, and the stress of replacing the sensor in the first place, the bolt was weaked a bit (as I don't feel I put too much pressure trying to tighten it up). I don't have the tools to fix it so I'm taking it to the shop today to get fixed. Hope they don't have to drop the rear axel to get it done.
BTW, averaged over 18 mpg over the trip. Pretty darn good for a 10+ year old 8 cyl mid-size SUV fully loaded at 75mph.