going to put a locker in the 07 auto would like to hear from some that have them,has anyone used a lock right i've used them in smaller trucks and they seemed OK

 

I think most guys use ARB air Locker, or a Detroit locker.

 

The optional diff is a worm gear. For most sityuations, you'll find the worm gear superior to the locker. It's smoother in the corners, transmists torque a little bit better. It's extremly durable, too.

A Detroit Locker style diff is OK for drag racing, and that's about it.

An air locker is something else again. That turns an open diff into a spool. For serious off roading, that's the hot ticket.

 

Go with an Air Locker. Detroit Lockers are way too squirrelly on the street