Help identifying this gearbox - t50 TRD?

[Jrad]

Hello wonderful mechanical experts, of which I am not!

I purchased this box a while back, and never took any notice until moving it today.
Now it's apparently a T50 -> 4age box - and it appears to have an ADM 4AGE bellhousing.
I noticed it has "TRD" stamped on it, as well as the TEQ on the same part of the gearbox.

Is anyone able to shed some light on this, what it may possibly be, what it may mean etc.?
I know TRD developed a close ratio box, but would they stamp it as well?

Thanks for any help in advance!