The 9. 25inch and 10. 50 inch diffs in the power wagon are a different spline count. The electrics won't work. We went over this on another forum... they are just enough different that they will not work.
The reason there is an ARB for the 9. 25 AAM is the fact it is the same carrier used in the IFS 3/4 and 1 ton GMs... they didn't build it just for dodge, we just got lucky. To my knowledge, there are no lockers available for the 11. 50 AAM axle as of yet (However, ARB is rumored to be making one). And even though AAM lists lockers and such on there website, I haven't heard of any distributors for AAM... they won't sell to individuals.
So we are basically stuck with the tracrite LS for now.
There is also a 3rd gen owner over at PS.com that has broke the stub shaft in the AAM with an open diff and 37 inch tires... a locker will only add more stress... hopefully his breakage was a defective part...
steved