If you already have the detroit locker, you don't need another one. Just get the correct carrier and transfer the locker over. No Spin = Detroit Locker.
However I was talking about keeping the eaton rear and installing a set of axleshafts and detroit from the 14FF as an upgrade. But since you already have the locker it will be cheaper to just change the gears and carrier.
The only difference between the Eaton vs 14FF Detroit Locker is the axle spline count. 14FF axleshafts are the correct length to install in an Eaton axle if you use the 14FF Detroit (or open carrier spider gears) for the matching spline.