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Just an update on transmission.
Valve body was ordered and installed but the issue still persisted so now waiting on a full transmission replacement. Hopefully that will solve it all.
I'm in the same boat, unfortunately. '25 2500 6.7L and absolutely love it.
Mine started having hard shifting from 2-3 and 3-4, but once it warmed up past 90 degrees it ran flawless. This all happened overnight, perfect one day the next morning the issues. After letting my truck warm up like...