The locking diff turns off at 20mph and does not work in 2WD without splicing a module into the wiring harness. Replacing the differential works at any speed, in any condition, all the time.
Thank you for your input.
Sounds like a street racing setup.
Most off roaders would rather keep their locking rear diff and I'm sure many would have prefered a locker up front too instead of the Torsen.