It looks like the ratios were 3.69 or 3.58 with the first being the later version. Amazingly enough the 280 and 240D both use the 3.69 or 3.58 ratios also. There is a 3.46 in some 300TDs.

I don't think it would be worth the work to go from 3.69 to 3.58 or from 3.58 to 3.46. Now if you can find a 300TD turbodiesel it should have a 3.07 and if you can get an 85 US turbo diesel I think they had 2.88 ratio.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician