Allison and other Automatic Transmission Questions
For answers to questions specific to the newer Allisons, there are others on this forum more qualified than me. Transrand, and Allisonman. I don't want to ruin this forum for everybody by competing. And hope Allisonman continues to answer questions.
As far as HP capacity, well I have seen transmissions that where designed for an under 200 HP engine take in excess of 800 hp.
Most all manufactures test their transmissions at levels they will never see normally. So there is a certain percentage of "over kill" in the design. Of course the more you load something the lower its life expectancy will be.
Another thing to consider is. During normal driving and cruising the hp requirements are fairly low. The only time HP is used is pulling a good load up a hill, or accelerating from a stop.
I would say with proper cooling, those transmissions would handle it okay. But wait and see what the guys that are more up todate on those units have to say.