What they seem to gloss over is how little Allison and Duramax care about making it so your truck will actually WORK for you. There is more out there than just pickups, guys!
All of what they were saying was true, but what wasn't covered is that both Muncie and Chelsea, the largest US PTO producers do NOT recommend putting PTO's on Allison pickup-style trannys. They are noisy because of the gear cut. Not under load, but coasting, like 99% of your driving. If you have a PTO on a chebby, you know what I mean. Allison will deny it vehemently, and say that it is the PTO installer's fault, or the PTO manf fault, but there is no getting around it.
Fine, if you don't want a noisy PTO, there is another way to get hydraulic power, using what is called a clutch pump. That unit is a hydraulic pump that you run with fan belts on the front of your motor.There is a set of brackets that you buy to bolt it all up, and the front of the hydraulic pump has an electric clutch like your AC compressor, and it has 2 dedicated belts to turn it. When the belts are new and adjusted properly, we can get 22 hp off of them to operate a tow truck, rollback, small dump truck, bale loader, or crane.
The only thing is, Chebby never put a keyway on the crank for the harmonic balancer! Just a taper and a bolt to hold it all together. They limited us to pulling 7 hp off the front of the motor. wow... all that power, and they will let us body builder/truck equipment guys have 7 of em.
But cute commercials none the less...
John