I am ahving a problem with the front differential on my 99 4runner. According to the stealership, someone put the wrong gear oil in and while driving the gear oil would heat up and be pushed out the breather. So they drained the diff and filled it. All for the low price of $35. Not complaining, yet. Have any of you guys had this experience before? I am not driving it in 4 wheel drive. The only people to work on that area was the dealership about 8k miles ago. WHne they replaced the tranny with a new one. No charge to me!