Hi all just had the gearbox inserts finished ..
The body is made aluminum and the tooth sprocket is steel (will never wear out ).But it could be removed and a cog fitted in it's place if that is what you wanted ...
I have the same gearbox fitted to my 24 volt c5 and it works OK no problem.
But i do not drive it full on .
so there is no guarantee on the gearbox or your motor as it is the way you use it that counts ....