It probably is failed but to answer your original question, you can pull the fill cap off the front diff and stick you finger in there. You can kind of tell the difference between old gear oil and old gear oil with grease in it.
Knuckle rebuild takes forever and is extremely messy. Lots of good info in search. Seems like its a rite of passage for LC owners. BUT its not an emergency repair necessarily so dont freak out.
Knuckle rebuild takes forever and is extremely messy. Lots of good info in search. Seems like its a rite of passage for LC owners. BUT its not an emergency repair necessarily so dont freak out.