2000 JD 450H Dozer

We have been working on this dozer for over 3 weeks now. Everything we've done is exactly what JD says they'd do if it were in their shop. The machine will not go into high gear. Low and reverse is fine. We've replaced computers, connectors, sensors! Does anyone have any recommendations? We're at wits end!
 
We have a 550H at work. I have changed the speed sensors in it and there is a calibration sequence involving about 15 confusing steps. You don't have to be off much and things don't work or shift right. Double check you calibration sequence. Also is it giving you any trouble codes?
 

It is calibrating correctly...forgot about that. But we're still getting trouble code...3M1.
Thinking it might have something to do with a sensor ring.
 

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