I know the W116 differential won't directly fit...there is another thread about this in the last 3 days....the W126 I would assume is a simular situation.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

"It will fit" and "All sales final." Hmmmm.
Did you ask what happens if it won't fit?
What is shipping going to cost?

__________________
Think Alternative Energy!
300CD '80 (now gone but not forgotten...)

I bought the item because he said it would. Now that i know this is untrue I guess i will have to see what he says about that.

I wouldn't be surprised if it did fit,
the 116 diff I just put in my 300td was a bit larger (taller) but it did not effect the fit. I thought in the one of the easter egg threads someone mentioned swapping between 123 and 126 diff's.....

Ya, don't give up the ghost yet. I have not heard anyone definitivley say that it won't fit. Find out for sure b4 you let it bother you. Might just go right in...Could be an easy mod.-too early to get concerned imho.
One of the experienced mechs here might pipe in b4 tomorrow, I would also call a few shops and ask folks who have done this sort of thing several times. And I love second and third opinions as well.

And if you find out for certain that it can't work, the buyer might be real cool about it. Think positive, this is the way we all learn.

__________________
Think Alternative Energy!
300CD '80 (now gone but not forgotten...)

I could have sworn I read the ring gear was like 210mm vs like 175mm ... so that could explain the taller cases...

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

I don't think you will have a problem. I went thru an experience when I bought what I thought was a 123 differential and had a shop swap it into my '79 300TD. It went in OK but we had a problem with the camber on the rear wheels and then the half shaft had some slop where it fits the differential. Then it was determined that it was a 300SD differential.
There are 2 precision ground spacer washers that fit between the half axles and the differential housing. Mine were the wrong thickness. I had to order a kit from MB that has several sizes and that turned out to be a long delay as they had to call someone in the shop at the local dealer and then after a lot of searching they foiund the kit number then they ordered it from Germany. It solved the problem, but I read somewhere on the SHopforum that these kits are obsolete and unavailable any longer.
FWIW, I am running a '79 200 TD with an '85 300dt engine and a W116 300 SD driveshaft modified yoke and a ?? 300SD differential. Lots of things can be done between series if you have a little know how and the drive to make things work.

__________________
'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!