AOD trans swap
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From: Seattle & Surprise, AZ
AOD trans swap
Has anyone done or thought of doing an AOD (AOD-E /4R70W) transmission swap in their truck? The advantage is to improve the fuel mileage by the use of the fourth gear, overdrive. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com
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Baumann Electronic Controls has the necessary hardware to adapt these transmissions to carburetor equipped (no computer) engines. <o></o>
Extracting info from Baumann data:<o></o>
The reasons for using an AOD (or AOD-E), instead of a C-6 transmission in your performance vehicle are obvious. The primary advantage of using an AOD is the potential for fuel efficiency with no resultant sacrifice in performance, thanks to the 2/3-1 overdrive ratio which made the AOD a clear choice for Ford Motor Company, as well as its customers. For example, even a steep 3.73-1 rear axle ratio becomes a 2.49-1 ratio during fourth gear cruise (3.73 x 2/3 = 2.49), allowing about 1000 less engine RPM at highway speeds. Not only does the AOD provide a better cruising ratio than a three-speed automatic, but it also serves to further increase efficiency by bypassing the torque converter in fourth (and partially in third) gear through the direct input shaft.<o></o>
AOD-E/4R70W article from Car Craft:<o></o>
Ford updated the AOD in the early '90s, strengthening it substantially and adding electronic shift control. It was soon equipped with a new, wide-ratio gearset and renamed 4R70W-and is one of the best transmissions Ford has ever made. "They can handle a lot of abuse," Baumann says.<o></o>
Manufactured: 1992 to 2005 OE rating: 350 hp Strengths: 2-inch-wide overdrive band for better holding power; stronger input shaft; torque converter is locked up by a clutch that can be pulse-width-modulated by the ECM; the 4R70W has a wide-ratio gearset that better matches shifts to engine powerband. Weaknesses: Needs computer to operate. Build it with: Heavy-duty direct clutch pack; 4R70W gears in an AOD-E; Baumann's ReCal-Pro valvebody calibration kit; Baumannator TCS transmission controller. Can be built to handle: 700 lb-ft Notes: The best transmissions to get are from '98-and-later cars; 4R70Ws from '96 to '01 Explorers and 3.8L or 4.2L V-6 Mustangs have a Windsor engine bellhousing bolt pattern, making them ideal swap candidates.<o></o>
fficeffice" /><o></o>Baumann Electronic Controls has the necessary hardware to adapt these transmissions to carburetor equipped (no computer) engines. <o
></o>Extracting info from Baumann data:<o
></o>The reasons for using an AOD (or AOD-E), instead of a C-6 transmission in your performance vehicle are obvious. The primary advantage of using an AOD is the potential for fuel efficiency with no resultant sacrifice in performance, thanks to the 2/3-1 overdrive ratio which made the AOD a clear choice for Ford Motor Company, as well as its customers. For example, even a steep 3.73-1 rear axle ratio becomes a 2.49-1 ratio during fourth gear cruise (3.73 x 2/3 = 2.49), allowing about 1000 less engine RPM at highway speeds. Not only does the AOD provide a better cruising ratio than a three-speed automatic, but it also serves to further increase efficiency by bypassing the torque converter in fourth (and partially in third) gear through the direct input shaft.<o
></o>AOD-E/4R70W article from Car Craft:<o
></o>Ford updated the AOD in the early '90s, strengthening it substantially and adding electronic shift control. It was soon equipped with a new, wide-ratio gearset and renamed 4R70W-and is one of the best transmissions Ford has ever made. "They can handle a lot of abuse," Baumann says.<o
></o>Manufactured: 1992 to 2005 OE rating: 350 hp Strengths: 2-inch-wide overdrive band for better holding power; stronger input shaft; torque converter is locked up by a clutch that can be pulse-width-modulated by the ECM; the 4R70W has a wide-ratio gearset that better matches shifts to engine powerband. Weaknesses: Needs computer to operate. Build it with: Heavy-duty direct clutch pack; 4R70W gears in an AOD-E; Baumann's ReCal-Pro valvebody calibration kit; Baumannator TCS transmission controller. Can be built to handle: 700 lb-ft Notes: The best transmissions to get are from '98-and-later cars; 4R70Ws from '96 to '01 Explorers and 3.8L or 4.2L V-6 Mustangs have a Windsor engine bellhousing bolt pattern, making them ideal swap candidates.<o
></o>
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AOD transmissions
A fellow by the name of Len Bertrand thinks the AOD is the best automatic overdrive transmission there is when properly rebuilt with the correct parts and has gone a long way toward proving it. One of the new electronic overdrives has a multitude of potential problems that the AOD does not have and is a lot more expensive. It is a non electronic and does not need a computer to operate.One of the mods he does is change overdrive to a selectable thing with a toggle switch. You can read about his exploits at HRM.
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