W126 Shop Manuals
 

I have the CD ROM manuals for the car but they do not include any technical data on the transmission and differential except for fluid changes. Is there any other source for this information?

Thanks

Try ATSG in Miami. I just looked around my things here at work to locate a phone number and address, but it must be at home. Search the Tech help forum for "ATSG" and it will turn up. I bought the manual for mine from them, for about $25 I think. Great manual.
Good luck!