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ahhhhhh.... yes that rings a bell. Have you tested that speed sensor in the tranny? think there is only two speed sensors on the whole truck.. bell housing and one in tranny. Didn't someone have pinched harness wires inside the tranny that had similar issue?

seem to recall a mention of RPM sensor wire issues (or sensor itself) . The one mounted on the bell housing... giving wrong or erratic signal. Maybe dig thru wire diagram and trace back to see for sure what the ctis ecu is using to determine speed to verify it is the one on bell housing or not...

thank you for throwing that info out there. started a new thread on this topic so not to hijack yours. When you find the time if you could elaborate more over there about these common failure points everyone would certainly appreciate it. Below is link...

thanks for clarity.... Understood that concept but had not yet heard in the FMTV community calling a portion of the Tcase a Diff. Have heard it termed that way in over the years about other AWD systems though. Again thanks for the clarity. So do I understand it right that there are clutch...

??? Diff lock?