Glow plug system I would begin to source/research a manual override/relay system. Simple to install and you no longer have the "glow plug controller/card/fail issues.
AKA You'll push and hold a momentary button switch on the dash for 10 seconds prior to starting... let said button go... turn key to start... VIOLA party on.
I believe the military crowd calls in the Doghead Relay for the m1008.
Driveshaft to np200 will just be an extremely short shaft. measure and contact local driveshaft manufacturer... done.
700r4 while not a towing transmission... the overdrive will save that 6.2 from demise.... good choice.