[donut]

Not going to quote a price, but looking at the same swap for my old K-20, it wasn't cost effective even with the 2 trans. in my yard. bk2life pretty much hit it. It can be a straightforward swap IF you have means to adapt or acquire the turbo 400 transfer case.

the turbo 350 and 400 do have different output shafts, size (may need driveshafts "adjusted") and the adapter.

When I looked into it, it was more cost efficient to have the turbo 350 built to what I wanted, though if you have a donor vehicle with the turbo 400 drivetrain....