reads this title... Nah! not likely!
Thank you all for such a good response to my questions.

rudolphgreen’s thread ‘holy 2.47 sleeper’ was informative but left me thirsting for the 2.47 In that thread, reiner and t walgamuth were saying a 247 came out of a 380

B.C. ‘The W126 diffs do fit the W123........just be sure that the W126 is 1985 or before.’

So If I have this right…. I can use a 2.47diff from a:
1980-85 W126 (does that mean an.SD? SDL? Or other models too?
1980-85 380?...gasser?
Or perhaps a 2.88 from a 1985 300D?
Have I got that part right? And are there any other years models for a 2.47 or 2.88 diff that will be easy for me to get the required parts from, and bolt up to my 83 300CD? Sorry if I seem a little dense, as I am newly afflicted I haven’t yet learned all the models.(and now while the wife is out of town I find myself studying models rear ends???)
Thank you all for your patience and assistance.