My h3t is having some issues. It is getting stuck in park, I know how to release, but also it now has stability failure and check engine lights on dash, also speedometer is not working and running high rpm with low output?!?

 

Miles on the truck, any recent work?

Have you checked the T Case speed sensor and its wiring connector and harness? Same thing with the T Case encoder motor for range selection.

 

miles 73500. Recent work...new CV Axel wheel hub calapers rotors and pads...

 

Get the codes read and post them here.

STAB FAILURE is probably one of the ABS sensors (you had a hub replaced).
Key stuck can be the neutral safety switch under the console gear shift lever.
Speedo is what Doc said to check