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Single Big Bang from Transmission Stumps Two Mechanics

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2014 Subaru Forester.   When I turn hard right it will occasionally give a single loud bang which sounds like a sledge hammer hit the underside of the car.  It can be so loud people in the parking lot will stop and look at me.  I took it to the mechanic and they said all of the suspension and steering looks great.  Sound is coming from the transmission area.   Wheels need an alignment so I'm getting it aligned tomorrow. 

Today, for the first time, it made the bang when I was braking hard.  It's the first time I've heard the bang while driving straight.   It also recently started making the noise when I made a hard left so whatever it is it's getting worse.

2 mechanics older than dirt looked at it and they didn't know what was going on.  Any ideas what it could be?  Front diff?  Weird CVT thing?  Odd the mechanics said it was a tranny problem when it almost exclusively happens during hard turns.

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Try this technique if it happens frequently enough - 

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The mechanics know where the noise is coming from, they just don't know what's going on.

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Well, maybe it's the external transmission mount. If the mount is bad, it might well go banging around on a sharp turn. Have they thoroughly checked the transmission mount?

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Count the mount be a culprit even when driving 2 miles per hour?  The bang can happen when I turn the wheel all the way to the right and simply release my foot off the brake.  No need to add gas.

It's a really loud bang.  Sounds like a 5 lb sledgehammer when it hits.  One one hit happens.  I've never heard 2 hits or more in a turn.

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