detroit truetrac is a limited slip differential; E-Z locker and Lock Right are "lunch-box lockers" and look very similar; PowerTrax, another lunch-box locker by Richmond appears to be an improvement over their Lock Right locker.

Wrangirl, luch-box lockers are designed to be installed by do-it-yourselfers (only, warranty voided by E-Z locker if not installed by professional), weaker in design than a Detroit, ARB or Ox full lockers.

Hopefully, you'll get out on the trail this weekend. One thing you'll likely experience is that in the front or rear axle, if one wheel losses traction, the slipping wheel will spin while the traction wheel will not; even if you have 4WD engaged. To obtain truly 4WD, four wheeler's install full lockers, either automatic (always engaged, generally speaking) or selectable lockers (driver can select locker to be engaged or not). A locker, very generally speaking, causes the wheels in an axle to rotate at the same speed; eliminating wheel spin and most likely getting your rig over an obstacle or out of a possible stuck situation. Hopefully, this is helpful. Now, go four wheeling, and have fun!