What differential did the 90-93 300D 2.5 Turbos come with? I haven't looked into it but was always wondering...

At 120km/h I read about 2700 rpm (of course it depends on the 4th gear ratio too).. but I can downshift no problem on the highway, and it will shift back up into 4th around 135 km/h.

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1991 MB 300D 2.5 Turbo (207000km) (now gone)
1993 Audi 100 CS Quattro (300000km)
1999 VW Jetta TDI (290000km)
2002 Audi A6 3.0 Quattro (150000km)
2005 MB E320 CDI (34000km)