Kickdown lever

I thought I'd posted this but now can't find it
This on a 46re in the Durango
I have this trans all blown apart on the bench as we speak.
I have heard lotsa talk about kickdown band lever ratios. How you gotta go "5 0" or how you absolutely don't want that, and more.
I know there are a few different ones out there.
I thought the Lowest was a 3.8 or so?
Well my Durango trans blew that out of the water.
I see on mine it's only marked "2.5". I never knew there was one that low.
How would it effect the shifts if I went with say a 3.8 or even a 4.2 ratio? Would I want to?
This is a 4wd, mostly daily driver, 4wd is rarely used except for winter. But I do tow a camper with it about 4000-4200lb in the warm months about once a month (well twice, once there and once back home haha) about 300-350 miles there and back... If that would play into what would be right for it...