when u do put the 6.2 motor. concentrate under the hood, make sure everything is perfectly done , strong radiator, good American fuel pump ac delco alt, etc, trans is secondary, u have many options on that, u can always put nv4500 or t56 that will kick any other diesel land rovers ***, as far as speed and durability
those motors are very strong and reliable , here is an example, my 94 hummer h1 with 6.5 basically the same as 6.2. kicks ***, i wanna see 4x4 that will pull me back to back, my hummer with 6.5 will brake any other trucks drive shaft or transmission , with love lol it has about 150k miles. and will go another 250k miles.
when ppl talk crap about those motors by saying it wont last more than 300k miles it makes me smile, 300k miles is around the globe travel 20 times, and when that motor goes bad after 300k. i am sure i can afford to spend another 2 grand on a new motor.
that's how i think of my rover,