I have the factory Clutch type LSD in my transit. I put a truetrac in my 2005 suburban. The truetrac is reasonably civilized and my wife never noticed a difference after the install. You could provoke it to pop if you got a little frisky mid corner. The ford factory LSD is slightly more civilized but again my wife doesn't even know its there. Also if anyone has driven a GM G80 locker the eaton behaves similarly. Its also important that if you install the truetrac you need NON synthetic gear oil. If you use synthetic it will not want to lock as easily. I think the oem and the locking LSD serve the same purpose in an on road 2wd application. Off road I would probably go locker. I really don't think the aftermarket cover is necessary on a transit, its not like you can install 35" tires.