For those of you do-it-yourselfers, I recommend that you consider getting a set of genuine service manuals for your A-T. Having one of these has saved me countless hours of "huh" and "WTF" when something has gone wrong with the A-T.
Ditto; be forewarned though, the factory manual calls for the use of many "SST's" (super secret tools?). Most times you can substitute another tool. Don't let it scare you away from doing the work yourself!