What is the crush washer? I’m about to do my 20 hr service.Just did 120 mile service. I bought oil change kit from local dealer. Only $28 for oil, filter, crush washer. This is a factory kit.
The reason for my post is to make anyone doing this aware of what I found on the rear diff/transmission. When I pulled the drain plug it was obviously under pressure and gear oil spewed out. Changed gear oil and then investigated why there was pressure. I found where the vent tube went up and then down into frame it was kinked in an S curve not allowing diff to vent. I could look up with light in frame and see kink. I pulled it out and clipped it off so it could vent pressure. Hopefully this pressure has not already compromised a seal. I don't see any leaks at this point.