Hi Scott, you ok? Its a five speeder, SWB auto 4.2's are rare indeed. Underneath its like any other 18 year old 4x4 but better actually. Yes you are right, the drive train is bullet proof, the axles are far heavier than 80 axles and I would imagine the gearbox to be equally over engineered. I don't know the diff ratios for one of these but I will start researching tonight.
Andy