FYI, just something to consider.
All selectable lockers, when locked, act like a spool. So essentially the rear tires are locked together as one axle. When unlocked it acts like an open diff. But this means when locked it may want to push the truck straight in some offroad situations if you have more traction in the back than the front.
A Detroit locker is different. Many people assume it automatically locks, which is not really the case(that is the case with a G80 "gov lock"). What the detroit locker and many lunchbox lockers actually do, is they are usually locked and they automatically unlock. Think of a ratchet, each side works like a ratchet and can spin faster than the ring gear, but not slower. So if you go around a curve the outside tire that wants to spin faster can disengage and spin faster. The moment it stops spinning faster either from going straight or applying more power than the inside tire can hold, then it catches and is under power again.
The drawback to that is there is a little more backlash so the cam can switch ratchet directions when you put it in reverse. This can be harsh sometimes, for example if you go around a curve or change lanes under power and you let off during that maneuver it can go from driving the inside tire to engine braking on the outside tire.
So a selectable can be either be a spool or open, whereas a Detroit is in between and in a way both at the same time, something the selectable cannot do.
Either way, having all power available to one axle means that axle needs to be strong enough to take all the torque.
Anyway, just helping you decide what's right for you.
