I just replaced the transmission in my 1980 300SD. To my knowledge (and I am no expert), only a transmission from a 1978-1980 300SD is compatible. However, parts from another W116 chassis transmission (such as the front pump) will most likely fit. I think the transmissions in the other W116 models are geared differently and that other chassis such as the W123 have a completely different type of transmission (they use different linkages and means of shifting).

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles