Tom, any updates?
For those with a locking rear end, you have un-equal length shafts. You'll need to either shim the passenger side axle out some with shims behind the axle bearing outer race (we used 0.090) or extend the splines on the passenger side axle by about 1/8" for clearance. Basically, the longer passenger side axle goes in just a bit too far.
We used old-style D44 ARB shims, which fit perfectly. I brought a couple home so that I could measure ID and OD, but I haven't done that yet. I also stopped by my local awesome dealer and picked up another broken axle. I plan on using the shorter driver side axle shaft from the new axle assembly on the passenger side of my current axle. Easier than using a Dremel to extend the splines.
Also, those with a locking rear end have a diff lock position sensor - just a plunger type sensor (you can see pics on my website). The plunger slightly rubs the TrueTrac carrier, so it must be removed. It can be replaced with an M14x1.5 bolt... about 1/2" long is all you need. Alternately, you could just snip the plunger off the sensor housing with a pair of dikes.