[Hummie2]

Tom, here is what you do:

1)If you have a floor jack (trolley jack) go out in the driveway and raise both rear wheel off the ground slightly. (about an inch or two)

2) get in and start the truck, shift to 4lowlock, apply the brakes lightly (just enough to illuminate the brakelights. This will disable Trac Control)

3) shift the transmission into gear and see if you can move the truck slowly with the rear wheels off the ground.

Does the truck move? If yes it went in lock ok. If no, does the front driveshaft spin? If the front driveshaft doesn't turn then the T-case isn't locked (all power going to rear axle only). If the driveshaft does turn and the halfshafts & wheels don't, then the problem lies in the frontend. (broken axleshaft, spidergear,etc.)

Being able to lock the rear E-Locker shows that the T-case motor encoder signaled T-case shift module that the shift to 4lowlock was completed, but did gears actually move to 4lowlock inside the T-case? (broken shiftfork)