Wonder if the engine can fit into it or not?
Most of the MKIV DMs use the THD101GC.
That's a guess, based on general performance characteristics.
And it would appear that a minority are actually fitted with the
THD102KF.
Nor is it accurate I guess, to conclude that the Voith MKIVs are
all 4 speed types and utilising the THD101GC.
Basically the original 115 strong fleet appears to be quite an
oddball with different combinations of engines and gearboxes,
although the majority use the THD101GC coupled to the ZF4
gearbox.