What's the best way to access it? Did you take one of the rear wheels off and get at it from the there? I have my brake and abs lights on and the speedo is jumpy. The front abs sensors are fine and easily accessible so I checked them first but it's more common for the rear to go. thanks

 

I had my truck up on axel stands on the frame under the bed with both wheels off.
I was replacing my stock LSD at the time.
I remember though, that I had plenty of access to the speed sensor.
If memory serves, that sucker is a pig to pull out. So don't be surprised to snap/damage the old one. Luckily I didn't.
Have you pulled the pumpkin for a look see at the toner ring?
You can also access the sensor from inside the diff housing to push it out.
Al.

 

Thanks. I remember when my father replaced his he said he gave it a 1/4 turn and pulled it out.

 

Lights are off now. I unplugged the cable and it had a bit of mud, dust, grime and road salt on it. I sprayed a bunch of WD-40 on it and let it dry and plugged her back up. I threw the sled in the back and drove the 35 mile round trip to go snowmobiling and they haven't come on yet.

 

Nice fix.
Al.