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It's stuck in fourth gear? That would be unusual.

You have a 4L80e where the "e" stands for electronic. Which means the transmission is electronically controlled. That being said, there are about a dozen basic things that could cause what you describe. Is your truck stuck in first gear or is it in second? If it's in second, it's probably in...

This is a diesel engine so there really isn't any vacuum. None of those tubes have anything to do with the transmission shifting issue you are having.