How do I identify the rear end on my car? I want to know if it has the wheel lock (not sure what term MB uses) or gear ratio but both options were available.

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If you are referring to a limited slip if it is a factory unit it would have had a tag under a bolt on the diff cover. The ration is stamped on the diff housing next to the cover on the milled flat surface that the diff cover bolts to.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Look at the option plate on the radiator support panel for #256. that is option number for a LSD if your car was fitted with one new. The parts are available new but used ones are hard to find.

I so wanted to say that the rear end is the one with the red lights on it but I didn't.

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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120