MeefZah
New member
That is my experience as well. Though I haven't crossed rivers, I have been driven through water/mud off road that submerged the truck up to the bottom of the frame on a few occasions. Each time I drained/checked the fluid and breather after, and there was no water intrusion. For peace of mind, if you do this often, considering the cost of synthetic dif fluid, it may be worth it to you to at least extend it. I plan to do it, but given my experience thus far, it's simply for my piece of mind.
I changed the diff oil a few weeks after this crossing and it was just fine...
https://m.youtube.com/watch?v=-fVw9N4T6aI