I have a 2008 6.4 that won't come out of 4th gear. I still have R,P,N but the only forward gear is 4th. I brought it to a tranny shop they told me the internals look fine, it's just not getting power. Does anyone have any ideas? I was thinking tcm and I reprogrammed it with no success.
Any ideas of what to do next?
Any ideas of what to do next?