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Since it's a auto tranny ^+1 on trying to crank it in "N" & while your doing that, also wiggle the shifter & see if it wakes up & cranks. If so, inspect the TRS = Transmission Range Switch, it's mounted on the drivers side of the tranny, just about below the drivers side door. Check the switch, electrical connector is undamaged & tight, wiring undamaged.
Since this is a 4X4, did the problem come about suddenly, like during, or after an off road event?
When you try to crank it, do the head lights dim Way down?
Ok good feedback. If the oil leak is from the valve cover gasket, before replacement, check that you don't have a crankcase over pressure condition from a faulty sticking closed PCV valve, or excessive blow-by from stuck, or worn piston rings.
Amazing what a new battery will do sometimes. Not sure how you tested yours but the drawdown when trying to start needs to be checked. A failing battery that shows fully charged will draw down rapidly when trying to start an engine. And fail at that point.