[Zoomad75]

TCCM's, Shift encoder motors and the buttons themselves all have problems. At our shop we see encoder motors more than anything mainly because the trucks might get shifted into 4wd once in a year. The feedback switch on the encoder motor sticks and even though the motor actually shifts to the correct range if the TCCM can't see it from the feedback switch guess what it does? Yep it shifts back to the last selected range and forces the light on the button to blink at you. Later trucks will blink and throw a "Service 4wd Soon" message pop up on the DIC.

Besides that the pushbutton cases are pretty well known to have the oil pump on the rear output shaft loose a snap ring and have the pump start grinding into the top of the rear case half and pump all the oil out of the t-case. They typically come in with wiped out output bushings and floppy slip yoke plus oil everywhere.

If you are going to do the work to go with a solid axle, don't go halfway and leave the junk t-case in there. Do it right, do it once.