I need some advice......

[MNYPNNY]

I'm so frustrated right now I'm thinking seriously about selling Penny.
Just spent nearly $2K fixing things that needed fixing and now I discover more.
Kept hearing an intermittent grinding sort of noise in reverse so I decided it was time to take her in to AAMCO to have the tranny checked out (still under warranty). Well, the tranny itself is fine. But it appears that the front diff is shot. Labor to take it apart, determine the problem, rebuild it, reinstall it: $420.00. Cost of parts: anyone have any idea?
What sucks is that they have to take it apart to determine what needs to be fixed, then the parts have to be ordered. So I'm probably looking at downtime of two weeks or more.
Anybody have any thoughts, suggestions, a good idea to collect the insurance money?

~~Michelle