I just did the rear end on my w115 240D. I had a rear bearing seize on me. I don't think I could have done it without removing exhaust. If I wasn't changing my whole exhaust system anyway I would have tried to separate the pipe, but if not possible I'd just chop it then put a sleeve on to re-join. I think that's an easy option.

I installed new bearings both sides, then did new axle boots and of course grease. I also installed a diff from a 300SD b/c of the different gearing I wanted. Search some of my threads to see some of the problems I had. Basically at every turn I ran into issues.

I haven't driven the car yet, my next step is swapping in the engine from the 300SD. Tonight I'll move the car in the shop so I can roll in the engine lift, remove the final engine mount bolts and pull the engine and trans. My manual 4 speed will go back in after being mated to the 617.

Cheers!