I bought some 2.5" pipe and a couple of mandrel bends from an exhaust shop today. Have now welded a 30degree bend to the end of the dump pipe. It now bends up slightly at the bottom and runs along the side of the gearbox. It pokes out nicely at the end of the gearbox between the rear output splines where the tailshaft goes in and the driver's side rear gearbox lift block.
Just need to work out exactly where I'm going to put the Cat and it should be easy from there.
The exhaust will then continue down the body and (rather than cross-over underneath the tailshaft like usual), it will actually pass over the top of it just near where it bolts to the rear diff - there is plenty of room now with this amount of lift. It will then wrap up and over the top of the main crossbar of the K frame where it will meet up with the rear muffler - again, plenty of room now.
Here are some pics;




This one shows the clearance between the turbo flange and the steering extension - plenty now
