i cant for the life of me find a tranny wieght for the ZF, but i do know that it is lighter than the t56, i think there was a major use of aluminium in the tranny, but im not too sure hey.
its also used in the jags as well as bmws as the standard auto transmission.
its a huge jump for aussie made cars though, as most of the cars made here, until the new mitsu came out and now the new falcon, were 4 speed slushers.