Notice the Locker does not use Spider gears! The Auburn LSD uses spider gears, but they are hardened.. Most likley the Auburn could handle the power of our V6's up to 500+RWHP without a girdle.. Go above 500RWHP, and just add the girdle to make the Auburn LSD tough as nails..
So this leads back to a single question.. Whats your goal.. I know my end goal is the 150 SHOT of Nitro.. Which means, based on the numbers already available to us, the Auburn LSD without the girdle would do just fine.. This is from the horses mouth.. Powerhouse!! Powerhouse used the 150 shot of Nitro on our cars, with the Ford 7.5" Traction LOK.. He blew the spiders, but still finished the run with a 12.31ET @ 111MPH.. He did this with slicks..
So if you put all those factors together, most of us will not run slicks, because it endangers other parts of our drive-train, even if the rear-end can handle the torque.. This like the driveline, clutch, and transmission..
Is the Detroit Locker really needed? No.. Because under a worse case scenario, which is shooting a 150 Shot to the motor, will produce numbers which start out at a 439RWTQ launch, and ends up at 300RWHP, and 300RWTQ..
So the Auburn LSD can easily handle this situation... Now if you were to get greedy with the Zex kit, and go for a 175 Shot, then even still, it wont be enough to hurt the Auburn LSD, but could endanger other components at the track while using Slicks..
Slicks is the big factor here.. If you plan to go more than the 150 shot, with slicks, then plan on replacing the driveline, clutch and transmission...
If thats the case, you might as well tub the car, and drop on some wheelie bars, because Powerhouse with a 150Shot, damn near lifted the front wheels up in the picture he posted.. You should also, go ahead and get registered for the next NHRA Prostock season, cause you will be rippin....
This brings us back to the Detroit Locker (True Trac)... At a cost of $359-$369 bucks, as opposed to the cost of the Auburn LSD, which is about $299, I say spend the extra $60 bucks and get the (True-Trac), only because its obviously the better of the 2 deals...