Original 3.23 gears with ABS reluctor. These gears came out of this housing and the inner pinion bearing looked good (the camera isn't doing these rollers any favors) so I just reused it all.
I use the Ratech Smart Sleeve
P/N 11002. Much lower crush torque and easier to get to the drag you need. We cleaned the pinion threads and splines, installed it into the carrier, installed the Dorman yoke, added the washer, and used the socket and a hammer to drive the yoke onto the pinion. Then we tightened down the pinion nut. It was around 125ftlb of torque that we started to get a drag reading on the dial indicator torque wrench. New pinion bearing drag spec is 18-36 inch-pounds, 10-15 on used pinion bearings. We ended up with 24 and called it good.
We transferred the 3.23 ring gear off the old carrier onto the Eaton Posi with the new carrier bolts. They have loctite pre-applied, and are left-hand thread. Torque spec is 89 ftlbs on those bolts.
I transferred the carrier shims from the old carrier to the new carrier. We installed the passenger side first, then gently drove the driver's side shim in. My calipers were on loan to a different buddy so I didn't get a measurement. It was pretty snug, but everything fit.
Don't mix the caps left to right; they're machined to their appropriate side. Torque spec on these is 55 ftlbs.
Backlash measured 0.009" - on the high end of spec (0.005-0.009) but I'll leave it.
After painting the gears and spinning them once with my hand on the ring gear to give a little drag, I got this pattern. Carrier location looks right but depth looks a little deep. If I were to reduce the pinion shim, the backlash would go out of spec. Maybe the pinion shims can be swapped from side to side to tighten it up a little?
At this point we were tired, and my buddy who's a tech at a local dealership suggested I leave it until the car is assembled, and if we want to reduce the pinion shim, we do it at his place on a lift with the axle in the car. Sounds good to me.
EDIT - Chevy DIY
says for used gears, ignore the drive pattern and focus on the coast pattern (due to gear wear). I will take more pictures tomorrow.