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Jeep Rubicon's come stock with a 4:1 geared 241J but the parts don't interchange with the 241c. That is an aftermarket gearset to change the low range from the 2.72:1 that it comes with stock to 4:1.
For $1800 you can buy a Rubicon RockTrac (NP241OR) and get giant planetaries and a fixed yoke instead of spending $1400 for weak compound planetaries from that company.
The planetary gearset in the 241OR is HUGE! New Process redesigned the gears and really beefed up the housing with lots of extra gusseting, to be sure that the t-case could deal with the additional torque loads. The planetary set in it is about twice the size of what you can squeeze into a standard 241.
Like CyberSniper said, buying a whole t-case that was designed from the ground up to have 4:1 seems like a much better idea since the cost is about the same.