It doesn't sound like its a clutch.....sounds like your linkage or Diff.....Because you could put it in 4th, it sounds like your linkage....
From personal experience i reconmend going to South County Ford in South City.
I know of quite a few people who are happy with there OE quality work.
Im don't know any independats in that area to i cant reconmend any....if in Sanjose id reconmend DJ performance.
Lupe