A potential "limp mode" for this situation would be to drive the truck in the conserve mode until the repair can be completed. This would disengage the RWD and ensure that the joint is not being put under any drive load to cause added stress/wear in a low, or no grease condition.
I spotted a LG LE in Franklin, Indiana on 2/26, parked on a side street in the downtown area. Seems that the initial "trickle" of non-employee deliveries has started to develop. Not to be too optimistic but, just a reminder that there is a large amount of pre-order holders that do not belong to...