[tet68]

So they milled the transmission case out of a 10,000 lb block of aluminium eh. and the end product weighs what
200 lb.?

Hahah, sometin aint rat. Probably a 1000 lb block but even that seems too high too.

[JoeSixPack1]

It does look a little short of 10K, but if that's only half the case and parts in the pic, and probably cut from the original block before machining it could be 10K.

7075 T-6 aluminum is pretty dense and that half case in the pic looks closer to 3000lbs before gutting.