I just got my copy of a new transmission book by Tom Hand. "Chrysler TorqueFlite A-904 & A-727 Transmissions: How to Rebuild (Workbench How-to)" https://www.amazon.com/Chrysler-TorqueFlite-904-727-Transmissions/dp/1613253354 This book is great for those working on their own transmissions. I am especially excited about the A904 specific information pertaining to race builds. There are even several recipes for performance 904 builds. Great book, I'm jus' sayin'