couple of corections.
yes the rubicon is a standard D44 carrier... almost.
it is a 3.73 and numerically lower carrier and it has 7/16's ring gear bolts instead of 3/8".
4.88 rubicon gears are nothing more than thick D44 gears with 7/16 bolts.
you can run a rubicon gear on a standard carrier. you just have to drill the ring gear holes on the carrier.
you can also run a standard thick gear on a rubicon carrier. but a special small part is required. a small bushing that reduces the bolt hole down to 3/8" id.
vette, viper, jag and alum ZJ D44's are a different piece of junk... er I mean carrier. with no significant aftermarket support.
Chevy, ford, IH D44's are the same front or rear and they will work in your rear D44.