The AW4 transmission is undoubtedly one of the best transmissions Jeep ever put into its vehicles. In its stock form the AW4 is incredibly strong, and they last forever. Toyota Supra owners love them so much in fact that they swap them in their 500+ horsepower vehicles. The AW4 is almost identical to the Toyota A340, it is produced by Aisin Warner. The AW4 does have its downfalls however, they have a tendency to run very hot which can cause issues if not dealt with correctly. Regardless their durability is what makes them a great transmission. I have personally seen them run out of fluid and have seen engine coolant run through them and they still work! I plan I swapping an AW4 into my Jeep as a replacement for the torque flite TF999. Personally, I hate the TF999. I have always had issues with them weeping fluid onto my skid plate and leaving a nice little mess for me to find the next time I was working on them. The AW4 will be swapped in along with a new transfercase I hope! For more information on the AW4 you can refer to...http://www.novak-adapt.com/images/pics/transmissions/aw4_transmission.jpg
http://www.jeepforum.com/wiki/index.php/AW4
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