8 3/4 open to sure-grip swap

Nothing to it. All you need is to remove the old carrier, swap the ring gears, set the ring gear back up with .006-.008 backlash and you're done. It's very self explanatory once you get it apart. A pair of spanner pliers something similar to these works well.
Universal Black Finish Steel Adjustable Face Spanner Wrench Pin Pliers For Round | eBay