Will a tranny from an 84 300cdt [722..315] fit into and work properly into my 82 300sd[722.303]. My tranny is toast and I have a line on this other tranny. Any help would be greatly appreciated. Stu

It'll bolt up but you can't drive a W126 incudtive speedo with a W123 tranny's gear drive. You can swap tail housings but it might not be worth the savings.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD

Thanks for the info. I would be getting the whole car. Is the tail houseing where the speedo drive is and if so I have changed those on domestic cars. Is there more to it like drive shaft lengths or is it just a straight swap. thanks

Shouldn't be any more to it than that. At most you'll have to retain the neutral start switch of the SD.

Sixto
95 S420
91 300SE
87 300SDL
81 300SD