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722.303 is your best bet for an OM617a - 722.315 is also a possibility - these are 4 speeds. If you want to change the gearing ratios you are better off changing the differential as an "overdrive" 5th gear wasn't fitted to MB transmissions until the 722.5. This is super rare and I think was only fitted to petrol engines so you'll have troubles getting it to fit to the OM617. 722.6s are next but then you've still got the problems of fitting to the OM617 again...
The 722.0 / 722.1 / 722.2 (if you can find one!) / 722.3 / 722.4 transmissions are all hydro-mechanical (often with vacuum) transmissions. After that MB moved towards electric / electronic control.
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