A833 O/D gears in an A833 1:1 ?

With the aluminum OD extension housing, I've had quite a few of them with the rear yoke bushing completely trashed and spun in the housing, ruining the housing

Good info.

I wonder why that is? Do you suppose it has something to do with the way aluminum heat ranges quicker than iron?

Aluminum sounds less and less appealing to me for what I'm going for.