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Hello, is the instrument cluster displaying dashes and not the mileage when you turn on the key?
There can be multiple reasons for that. It could be a cluster out of the junk yard or it could have been installed without the correct mileage. The people that rebuild and program the clusters are the only ones who can fix this. Your cluster would have to be mailed out in order to be correct. This won't cause the concern you are having though.
Does cluster does need to be programmed to the vehicle in order for everything to work correctly. The incorrect mileage however won't make a difference.
The cluster not being programmed shouldn't have any affect on the transmission acting like it's in neutral. I would perform a pressure test. If the TCM programming is corrupt you can have this issue though.