While millions of Ford rear-wheel-drive cars are equipped with the durable and simple C4 and C6 transmissions of the 1960s, early in the 1980s Ford replaced those old designs with the AOD transmission for a new generation of cars. Overdrive gears, once popular before WWII, were now becoming popular again, as manufacturers were under increasing pressure to raise fuel economy to meet increasingly demanding EPA standards. A nice byproduct of that was more comfortable cruising speeds, at which your engine didn't have to work so hard as well as increased fuel economy. pIn iFord AOD Transmissions Rebuilding and Modifying the AOD, AODE and 4R70Wi, author George Reid walks you through the process step-by-step, from removing the transmission from the vehicle, to complete disassembly and cleaning, to careful reassembly, to proper re-installation, and road testing. Performance modifications are also covered, as well as an ID guide for various model numbers, evolutionary design changes, shift kit