any disco-owner with 300Tdi autobox??

[rangie]

disco-owner please help me with your experience and inform me about some figures considering rev's at certain speeds

80km/h
100km/h
120km/h

i suspect my engine is revving to high
f.e. 120 km/h 3600rpm
80km/h 2400rpm

i have a ZF autobox from a '96 disco Tdi but the transferbox is from Borg Warner 3.9V8 engine('91)