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The lockup at the torque converter helps with fuel efficiency and eliminates fluid coupling lag. These surplus AT1545s were super-popular with the skoolie crowd because of that, mainly for the fuel efficiency improvement. It was also great that it could almost straight-up replace the common...
You can downshift the AT1545 too. The Allison manual says it's an acceptable way to engine-brake the truck going from Drive to 3rd since 3rd locks up at the torque converter. I downshift at 30 mph when slowing to stop or make a turn at an intersection.
I can't help but think that the problem has to do with half the transmissions guts being made of fibrous clutch bands 🤔 I think of them like brake shoes.