Allison PTO operation

The 1000/2000 Series transmission utilize a 6-bolt PTO which operates like a PTO on a manual transmission.  The only way to put the PTO in gear is to stop the truck. If the torque converter is in lockup (higher gears), the speed of the PTO drive gear is equal to engine speed (Lockup Mode).  If in converter mode (lower gears, neutral, reverse), result is variable speed and torque/RPM is always lower than engine speed.  

This is not considered a LIVE PTO.

NOTE: With the vehicle stopped and the engine at idle, PTO output speed is dependent upon the trans gear selection:

• If the transmission is in a DRIVE gear or REVERSE, PTO output speed is zero.

• If the transmission is in NEUTRAL or PARK, the PTO output will rotate slowly.

If you need a LIVE PTO, operates in motion, the larger World transmission uses a 10-bolt style to accomplish this. The 3000/4000 Series transmission PTO’s are driven off the pump side of the converter, so when the engine cranks, the PTO gear turns, which allows for a Hot Shot PTO.  

Remember: The 1000/2000 series transmissions operate completely different than the 3000/4000 Series in PTO mode. Don’t go thinking you’ve found a way to side-step the transmission series up-charge, the trucks will not function as expected. And now...

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Believe It, Or Not

The term “Dog Days” dates back to Roman times, when it was believed that Sirius, the Dog Star added its heat to that of the sun from July 3 to August 11, creating exceptionally high temperatures.  The Romans called the period dies caniculares, or “days of the dog”.