Water intrusion? What caused this?
Definitely wasn't water. Toyota or I caused this (my 3rd rbld / 2nd 4.3 R&P broken on this diff).
Last time for me was 2017, it was re-built with best possible parts and builder at that time. I was watching fluid level / changing often through last summer at least and it was perfect like honey each time. Lately however I'd developed something of a rumble in the drivetrain since a LONG hwy trip and a few trail rides and hoped it was my beat up rear driveline.
Anyway, last week the diff popped and ground while I was trying to drive out of a mud problem under a hard traction pull. I was surprised it let go when it did so suspect it already had either damaged teeth or low preload from hard livin'.
Generally I say 100's just do this sometimes. I always add that mines heavy and used mostly for offroad trips and I do push it hard / and other folks seem to get away without trouble.
I've lost track of how many 100 front diffs I've helped disconnect so folks could keep driving but its about 10:1 vs CVs (which is a more common fuse/failure point on this type of suspension design like the 4-tacos).
...this is just like my opinion and experience though man.
PS: Love my 100!
www.303shockservices.com
😁
