We're definitely a multi platform forum. But your situation likely exceeds the know how of anyone who's not well versed in FCA tech.
I know my way around these trucks and vehicles in general but I'm stumped on your situation. You've got a multitude of things going on and I don't know where to begin.
The failing to downshift could be related to APPS, poor TCM mapping, solenoid damage, etc.
The boost and EB issues sound like a bad actuator, not sure what else to suggest there.
I may have missed it but do you have any codes?
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