Nice to see such excellent use of our language. Refreshing change from some of the slang that gets tossed around. Not that anyone on this forum really does that much, but sometimes it's a challenge to get through some of the posts. On to your problem. You might want to check the differential vent. I've heard if it gets clogged air pressure can build up and cause your seals to leak. I actually have the same thing going on with my truck at the moment. I just changed the seals about 3000 miles ago and there were no grooves on my birfields. During assembly I was very careful to not damage the seals. So, I'm going to check the vent first. I've never touched it so hopefully I'll find it to be the problem. Good Luck. Finding a good mechanic is difficult. Get a reccomendation from the local police dept. they usually find the good ones.