Are you sure it is gear oil? And where exactly are you finding fluid:mine seems to be "sweating" fluid through the metal. is this something covered under the rust warranty on the truck. and is the rust warranty 10 years? cause mine is a 2001. any suggestions?
How did the gear oil inside look? I would think for there to be that kind of corrosion there must have been water inside the housing.
This is what my rear differential oil looked like the first time I changed it after I got the truck. Looked like mud. Later I discovered there was no breather on top of the axle - just an open hole. I did the breather modification awhile back and think it is the best investment ever. Have not blown a seal since the modification.^ Indeed, been in any deep mud holes??