The drum overspeeds at 2:1, so at 23K you would need 11,500 input RPM.

SFI used to use 727's to test trans shields because the front drum was so easy to explode.

LBA valve body and a billet front drum do wonders, and cost a lot less than a blown up trans.

I have seen cars as slow as 13:70's blow up a 727. The guy got a broken foot fdrom pieces through the floor. He did not want to spend the money on a LBA valve body and did not have a blanket. The month off work cost him a whole lot more than that.

Griner has also fixed the overlap issue with LBA.