Here we go.
Its a paste and copy from here:
Any step by step to change the Diff W210 E300TD? - Benzworld.org - Mercedes-Benz Discussion Forum
OK, it was the day of swapping differencials, it went more or less OK, I got trouble with the nut that hold the diff at the front, it was turning freely, not going down, I stripped the car inside to see if I could find the nut under the seat, nope, it was inbetween the chassis hidden on top of the subframe. A spanner 17mm hold it while unscrewing the bolt.
The mounts needed to be banged/ shisel away. Pfff...
The easy way we figure out was to put a lever in the middle of it, pull the centre part out ( mine was not hard to do, I reckon the rubber was gone) then bang/shisel the outside that is left over. The easiest way is to go from the middle side of the car, like you look at them facing the rear of the car. Does this make sense? This because they are coming out about 50mm and its easier to bang it there to break through.
The picture I show are from the other side, this was the first one and we didn't know.
To put the new one in, well, banging on the outer casing on all "corners" and it slowly fit in.
Still clunking a bit here, my diff was not the bother I guess beside leaking from a side seal, it must be the way they are?
All the best.
Olivier
Oh, pictures to get the donut out the easy way, just put an allen key in and lever it, it come out really easy.