It's been awhile since I read about ASD, but my recollection is that it is basically an open differential with a mechanism to lock if slip is detected, but the locking only occurs at speeds below 15 MPH, so it will not prevent wheel spin exiting a second gear corner hard (at a speed above 15 MPH) like a conventional limited slip diff will. It's probably an asset for snow traction or drag racing, but not autocross or road racing.

A conventional limited slip diff has preload and can be tested by jacking up one side of the rear and determining the amount of torque to break loose the wheel. Be sure to DOUBLE CHOCK the opposite front wheel so you don't drive the car off the jack. Typically you want to see at least 45 lb-ft prelaod using a torque wrench on a lug bolt.

If ASD is basically and open diff rather than a limited slip, it will not have any preload.

ASD requires some sensors and electronics, and I assume part of the control system is external to the diff, so just bolting in an ASD diff without all the system sensors and controls will probably be the same as an open diff.

Duke