Rubicon 4.10:1 gears are a thick gear so you will need the small gear carrier, 3.73:1 and numerically lower. The gears also use a larger bolt, 7/16". So you will have to ream out the 3/8" hole in the carrier and get new bolts.
I have some gears I'm planning on using in a spool when the time comes.
This info was given to me by Kevin at 4wheelersSupply.com
Hope this helps,
Keith