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Sry I didn’t know, my dad said it’s an Eaton ultra plus!

I’ll pass this on as possible solutions and let you know thanks!

My father owes the truck in the title of the thread and he is having an issue that no one around here can help him with, while traveling ruffly 2 hours the truck will no longer shift and will get stuck in the gear he was last in, some light flash here and there but when he proceeds to come to a stop along the road we can’t turn the truck off. With the key turn off and taken out of the tru k it still runs with all dash lights on. Does anyone have any idea what can cause this issue?