I have only used these on a late model diff, but I hope uploading them helps someone out! All parts were printed with a .6mm nozzle, 6 walls, 25% infill, and using CF-PETG. 

The side and rear adjuster allow the use of a 1.25" socket to position and set the preload via the side and rear bearing adjusters. The square drive holes in them were not enough to achieve proper preload, so CAUTION on that!

The side driver allows the ring gear carrier to be driven by the side yoke output splines using a power drill (using a square drive adapter). This can seat the ring gear carrier bearings after a light preload. Similarly, the "vair_diff_driver" can drive the input splines on the pinion shaft to seat the pinion shaft bearings.

Set the final preload after the running in with a drill. Also via use of an adapter and the side or rear driver, an appropriate inch-lbs or similar metric range torque wrench can be used to set the preload torque.