The 6spds are difficult in swaps due to how new they are any the small aftermarket they have compaired to the 4L80E.
The case is bigger than typical 4 speeds and the TCM is difficult to tune just right! You will need the new shifter out of the truck which gives you the options to row thru all 6 gears.

It would be a great swap no doubt! And you would love it! I say go for it!