AutoZone.com

Register and you get access to their online manuals.

Not exactly a downloadable complete Chiltons or Haynes,.. but much of it is in PDF format, well structured and organized into categories that you can easily put together a printable manual or do like I do an look up what your specifically looking for.

I've yet to come across a complete documented manual for Mustangs other then the 64 - 70 models. Even the Chilton's books will have many important facts and tricks of the trade missing. I think they stopped producing complete manuals after 1978 or so because everything after that is incomplete,.. (from a mechanics perspective).

Edit:
And for future reference.
We're mostly old f*ckers in here. If you want a fast answer, dont use short hand or cell phone text or worse,.. ebonics. We dont understand. No offense,.. just use plain English and you'll get a much better response from most people in Ford Tech. I had no clue WTF FSM meant. And I wasnt about to ask,.. I figured if it was important you would ask again and someone would ask what you meant.

Hurst