My mechanic said my front differential needs to be repaired. How much? on 2004 Ford Explorer

My mechanic said my front differential needs to be repaired. How much?

1 answer 4 comments
depending on whats wrong it could cost upwards of 1000.00
So what would be my best course of action? Is there a standard fix for this? Can I just call local Ford dealers for an estimate?
so your mech can't or won't r/b it for you? how about saving some $ and ck prices on a good used one from wrecking yard. if you want r/b google diff repair
Oh I think he will repair it, but I was just trying to see if he was being fair in his estimate.
what was his est