The transmission in my roommate's 1991 W126 350SDL has no reverse due to a bad reverse clutch pack. It's a 722.361 transmission.

I picked up a free transmission from dieseldiehard that was supposed to be from a W126 350SD. But now I am looking at the transmission and it has a 124 part number above the oil pan and at the rear of transmission by the yoke. It is also stamped 722.317 above the oil pan, so I would say it's actually a W124 transmission not a W126.

Is this going to bolt up fine, and is the gearing going to be the same? I wonder if I should just attempt to replace the reverse clutch pack on the original transmission.

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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