MT545 is not a thing.
You probably mean AT545.
AT545 is awesome around town, but it's the worst choice on the highway. I know, I have two of them. It will get you where you're going BUT it's much less efficient at highway speeds and especially on big step hills. Under those conditions its turning horsepower into heat instead of into work, and that heat is what tends to kill them. Adding an extra cooler will go a long way towards keeping that heat under control but it's still going to be losing that power.
The issue is that there are no lock-up gears. You're always on the torque converter, which isn't a big deal around town, gives for a nice smooth ride. But on the highway where you're in the upper range of input RPM it's actively hurting you.
But again, I've put a ton of miles on mine, including every damn mountain area west of the mississippi. It can be done, but you need to be aware of your temps and not be in a hurry.
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