Rear Axle 2+2

It's an axle that uses spacers where you mount the hubs on the axles. With the spacers on, it's 2" wider. Without the spacers, it's the stock width.
 
You guys contradicted each other....one says it's minimum +2, max +4. The other says minimum is stock width, max +2.

I'm pretty sure sicivicdude is right.