The gearbox itself only put ZF..Are you working for SMRT
technical officer?
I don't work for SMRT or anything related to buses.
The gearbox wouldn't just put ZF, there would be a plate on the
gearbox stating the model, serial number and essential specs.
For eg.
Further to that, the Australian data sheets for the A22 and A95
are professional and legally required documents. The fact that the
only A22 currently in Australia is an ex-SMRT bus, plus the fact
that there is no other gearbox other than the 6 AP 2000B and the
Voith option stated in those sheets, clearly shows that the SMRT
A22s use the 6AP2000B gearbox. You may like to ask your friend to look at
the manufacturer's plate of the gearbox, I suppose it is not too
difficult for him to do that?