That power traxx sounds good. In the middle between Lsd and a detroit locker I think. The air lockers are 6 or 8 hundred I think.

 

I tried the Powertrax No-slip and was disappointed. Installation was straight foward and easy, but drivability was a let down. It is designed so that in a turn the outside tire ratchets and unlocks and power is applied to the inside tire. Well in a turn the inside tire is the one that gets unloaded, hence, wheel spin aroud corners from inside the tire. If it's wet, snow covered or there's loose gravel expect LOTS of wheel spin. I wound up taking it back out and using a modified clutch pack build up of the factory limited slip, that I got from the corral (Mustang) website, with great results. Just my .02