So i tried posting in the locker FAQ thread... but im not sure anyone is reading it anymore. Here we are:

I have an issue (I think), that would be great to hear a bit more about.
So I have a 1986 4runner, the previous owner installed a locking diff in the rear, I believe it is an Aussie. At first it freaked me out, cause I didn't know how it should be behaving. Anyways, I'm used to the clicking and the issues with sharp turns of pavement. However there is one thing. I have the diff out right now cause I am doing some work on it, and it seems like there is a lot of play within the locker mechanism itself. Is this normal? If I stick one axle shaft in and rotate it I can feel a pretty definite amount of play before it catches. Anyways, just wondering if this is normal behavior, or something I should worry about. I read another similar post, they said their rear driveshaft had about 20degrees of play (wheels on ground in park, trans in neutral). And I think that would be about right, anywhere from 10-20 degrees of a turn of play.

Thanks,
Shane

 

That sounds about right for an Aussie. I think mine is similar. Automatic lockers like the Aussie need some drive shaft free play for the ratcheting mechanism to switch from wheel to wheel and from forward to reverse torque.

It'll be much greater play than with a stock open differential.

 

As someone who is currently using an aussie, a lot of rearend play is normal and more noticeable if you have a manual trans. I have had many other brands of lunch box lockers in the past and the aussie has the most "play" of any locker Ive had.

 

Ok, thanks for the info guys.