The answer to car manuals is like reading history. Make sure you get two different source materials. Haynes did their own tear downs and write ups. Pair that with the OEM manuals, and service bulletins, forums and you get a good picture. The reference book for saab 900 is the Bentley Bible. Its a fantastic resource but the Haynes has a transmisson teardown and rebuild and better info on older trims. Pair that with the service manuals from Saab and the forums and you're rocking