The exhaust on the old truck is pretty much a non-issue. On mine I've worked out there's a bit missing between the Y and front box! The old truck appears to have some kind of flexible (anti-vibration?) joint here - the local tyre place reckoned mine had an incorrect joint (two female sides when one should be male) and bodged it together without the middle bit (they stuck a joint of some kind in there, but it isn't the right one - has to be periodically resealed with exhaust putty
Seems like a good excuse to get the missing bit and fix it properly.
What do you use to raise and lower the transfer box? The workshop manual says to fabricate a special bracket and bolt it to a hydraulic platform, which is a bit beyond my means. I've seen people saying you can drop gearboxes with a trolley jack, but I doubt mine will go that high. Is it worth seeing if I can borrow or hire a gearbox lift? And if so, where from? Can't imagine it's the sort of thing the local HSS will have.