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So your 6.5 is 700 lb.s, and you want to add twice the weight. That will affect your handling. Just buy a turbo kit from the site sponsor or a whipple and be happy.

I’m told 4 BT is as tall and annoying to install as 6 so you mightas well go with a 6. You will need a substantial lift. There is a website called 4btswaps. You should check it out.

Electric IP and pump will cause grief. You have the perfect block so swapping is questionable. 12K shafts are for heavy rigs weighing 12k. You don't need them. Tranny swap with 700R4 vs 4L80E is a good idea. Advancing timing and flow rate on existing IP will give you what you want. Everything...

Well, back in the day when Panzer tanks were a thing, they used flat cut gears and not helical for the top/high gear. They used to break those gears at speed as helical gears will allow several teeth to mesh at once, dispersing the forces. Forgot where I heard this BUT my dad was a tank engineer...

That is what I attempted to describe. Why in Hell's Bells would a loud military truck with a weak detuned engine need those gears.

Civilian hubs off of a civilian H1 with a Duramax engine. In other words, nothing super special unless they have CTIS. Gobs of money with limited payoff in a non-turbo non-Duramax. IIRC, the gears might be a little quieter with herringbone/slanted meshing.... Sounds like someone has a lot of...

Why would you not upgrade the engine to turbocharged GEP? Why would you upgrade to 12k axles and boxes when you want your axles to be the weak spot in order to protect the drivetrain?