ORIGINAL: Grits
The Aftershock comes forward only. If the OWB in the engine is in backwards the engine may start but the OWB in the tranny would not grab and the truck wouldn't move. My guess is that the diffs are both installed upside down. There should be the word TOP on one side of the diffs and this should be visible from the topside of the vehicle.
OOOPS[&o] That's one of the differences I keep forgetting about between the LST and the Aftershock..My bad