I was replacing the rear differential oil on my 4 cylinder 2010 Rav4 4WD and I couldn't help but notice the CV axles where it meets with the rear differential slides in and out about 1/4 of an inch. Is this normal?
There appears to be no noise. Although I did notice the bottom of the rear diff was mildly soak with oil. I couldn't tell where the leak was coming from. Gave it a good clean and will check after a few drives to where it's leaking.
Yeah I also changed the transfer case oil. The case had 85w-90 but stores only had 80w-90. I hope that's ok.
If ours is anything to go by, it could be the breather on top of the diff is partially blocked, causing oil to pass the cv axle seal. It seems you are handy on the maintenance, so it is a job you can do yourself. It is just a pain to drift the rear cv axles out, but it can be done.
Check the location of the breather vent and if the set up is similar to an 08 like mine, the vent can be changed by lowering the diff just enough to access it. I didn't have to remove any axles when I did mine.
By the way, the main reason the axle seals leak is because the breather vent gets plugged, like Bigphil mentioned.
Check on here for the threads talking about it. Good luck....