I would say its a 99.9999% chance its NOT an overdrive....#1 its an automatic and even in the early 80's Benz had no overdrive automatic. Plus thats likely a 3 speed but I will admit I am not familliar with that model benz you say it was from.

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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)
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