I am pretty sure your center diff did not go. The new Genesis diff is vertualy indestructable, something that can not be said of the savage. anyways what probably happened was the truck was switched into reverse/forward while under power. Since Genesis is not built with a slipper any movement of the shift lever will cause teeth to break in the center trans, locking up the transmission. It sounds like either user error or frequencies got crossed. I love my genesis, have had no issues, and would definately recommend one. Just make sure it is in your skill level.