Ok everyone,
Problem solved, Turned out only to be one (1) Speed sensor at the top of the transfer case. An easy repair took all of five min. I did have to disconnect the battery as the reset procedures for the GEM did not take effect. After reinstalling the battery cable, the lights stopped blinking and the 4WD low kicked in as normal.There was no leakage when replacing the sensor.
Thanks to everyone for the input.
Searcher1