I have not done this, But I can not imagine that it will be a hard swap to do. I think the only real hangups will be the crossmember and the Clutch pedal /master cyl setup. And i don't think even tat will be a big deal. Obviously driveshafts will need to be checked for fit.
There was a guy on here that did the NV3500 swap to a D-series, but it was 2WD. I think he said it was a straight foward swap too. And being your truck is alrady a 4X4, you have the bigger floor pan which I am sure your going to need with the NV3500 due to its bigger size. I know it is alot easier to ask if someone has done it, so you can find out about problems, but with no responses, I think you will have to maybe try some other boards---maybe someone at RamchargerCentral has done it.
I know I had to do a ton a research and measuring for odd things I have done, it just takes time. Luckily for us---similar to GM, Mopar kept things rather simple and easy to swap parts.
If all else fails, get out in the garage and go for it!!