Good evening,
The external should be changed at 50,000. The internal is done with a transmission overhaul. Here is a video of the job being done
https://youtu.be/pHPkHP4m0SM
Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
Image (Click to make bigger)
Tuesday, January 15th, 2019 AT 3:59 PM