alssjs

Here is a tough one..

Shown below is an older Duratrax Steel differential, factory assembled..

42T gear

This was packaged by Duratrax as DTXC7383, which was supposed to be
an optional Ring Gear for the Overdrive ST, but it will not fit on the Overdrive..

It was a mispackaged part and I am having a tough time making an ID as to which
or what the heck it goes to..

Any help or suggestions is very appreciated!