Anyway to all, my bad for claiming that
SMB1587C and SMB1640G are
equipped with ZF transmission - as I have judged them by the rims
of the rear wheel (or whatsoever you call it) and it was with a ZF
logo..
So despite them having the "ZF logo", that doesn't mean that they
are ZF..
Batch 3 buses with Voith DIWA D864.5: SMb1568H, SMB1582R-TBC
what you saw with the 'ZF' logo is actually the axle hub of the
rear axle; the rear axle is a MAN HONP-13100, essentially a
badge-engineered ZF AV132. The AV132 rear axle family is shared
across all LF buses in Singapore, including the E500 MMCs, WEG2
B9TLs, Citaros, MAN A24 and A95 as well as SBS7888K.
To digress a little, SBS7888K
uses the same ZF AV132 despite being low-entry because the ADA1300
used on the KUBs would not allow for a lower rear 1/3 like the
KUDs.