Kain
3/4 ton status
read your directions the mile marker hubs say not to put grease in them but if you do wheel bearing grease

Did you resurface the rotors also when installing new pads.
The rotors can glaze up, new pads don't always seat and grab properly.
You didn't break into the system otherwise?
Did you get grease on the rotor surfaces?

If the clicking and heat only happen with the hubs locked, as stated above, than it shouldn't be the wheel bearings. The heat and clicking may or may not be from the same thing. For the clicking I would check for anything loose inside the locking hub, than go to the spindle bearings, axle shaft u-joints, and even check out the driveshaft u-joints. I had the CV joint (transfer case end) of the drive shaft that would click under light loads or running with the hubs locked but not in 4wd, but it wouldn't make any noise under load. Seems pretty common for the spindle bearings to be neglected on these rigs as they often get overlooked when repacking the wheel bearings. They fall apart and the axleshaft turning makes the noise.
For grease on the actual locking hubs I use regular wheel bearing grease but only a really light coat....put a little on my finger and lightly smear some around. If you pack a locking hub full of grease they usually won't work very well.