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Allison HT740 transmission

alan007

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Location
Bowling Green, OH
Anything with an SAE #1 flywheel that put out 445HP or less at 1400ft-lbs or less peak torque. Really common in the private sector too - my Bus has one.

One thing to watch for - the lock-up clutch on the military version is aggressive, this is why they had to put anti-lock brakes in the M939 series trucks. Guys were stomping on the brakes and the lock-up clutch wouldn't release, killing the engine and thus the power steering.

[Edit:] Should note, the lock-up clutch is accessible via a hydraulic port - you can add a solenoid valve and make the lock-up clutch controllable. I have a full factory service manual if you have any questions [/Edit]
I would certainly like the information on adding a solenoid valve. I have a 900 series truck with 1000 miles on it. We can't get that lock up feature to release... obviously it kills the motor. Thanks for any additional information you may have.
 
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