Upgrade F250 Diesel Automatic 4 speed possible ?

hey brainaic Ford guys ...
is it possible to upgrade a 92 Ford V-8 Diesel Truck 3 Speed Automatic Transmission with a 4 Speed Automatic Transmission ... just swap it out and
go. I want to increase fuel mileage by having the engine tack lower with a better gear combination available for use.
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Not cheap, $3000 plus shortening your driveshaft: 3 speed: http://www.gearvendors.com/f2wd3s.html or 4 speed: http://www.gearvendors.com/f2wd4s.html
Lynn
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yes, you can swap the C6 out for an AOD or E4OD trans.to use the E4OD trans, you will have to add the trans control computer. and remember, the transmissions are engine specific. only a diesel trans will fit on your diesel engine.

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