AAMCO is like any other franchise, good bad and somewhere in between.
Years ago, Lee Myles used to quote a price +parts. AAMCO advertised that on a rebuild, all the wear items were replaced, otherwise you were getting a repair.
I would shop around and ask just what they intend to do, and if it's a + parts, get a maximum price before they tear it down. If they can't do that, you might as well take your money to Vegas.