AOD vs. 4R70W While our transmission was strewn out before us on Glassbrenner's bench, he was able to show us the hard part differences among the 4R70W and its predecessors, the AOD and AOD-E. The differences are surprisingly few. To change the ratios, Ford engineers redesigned the planetary gearset. Note that the 4R70W reverse input shell gear and sun gear (right) are a smaller diameter than the AODs.To change the ratios, Ford engineers redesigned the planetary gearset. Note that the 4R70W The smaller sun gear allows for bigger planet gears in the 4R70W carrier (foreground). This accounts for the 4R70W's higher torque load rating.The smaller sun gear allows for bigger planet gears in the 4R70W carrier (foreground). Thi Models built after 1998 utilize a mechanical diode in the intermediate clutch, replacing its predecessor's roller clutch. This type of clutch works like a ratchet and is stronger than the springs and ramps of a roller clutch. Unlike a roller clutch, the mechanical diode is not rebuildable and must be replaced if it is not functioning correctly.Models built after 1998 utilize a mechanical diode in the intermediate clutch, replacing i There are some other bushing and bearing differences, but think of the 4R70W as an evolution of the AOD. You can rebuild AODs with a 4R70W gearset if you want that transmission's ratios.There are some other bushing and bearing differences, but think of the 4R70W as an evoluti SOURCES Remac Transmissions San Dimas CA _____ 909-562-1006 www.remactrans.com Tav-O-Matic Transmission Parts El Monte CA _____ 626-582-1884 « | 1 | 2 | 3 | View Full Article By John McGann Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!
