I understand swapping one out for another but the question was can I get a 4:1 planetary for my current non Rubicon 241-J case?
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You are looking at this from the wrong aspect , adding the planetary would require dollars squared , new case components , the planetary , shafts , ect….ect …
Swapping to a Rubi Transfer case would cost less than a 1,000.00 dollars for hard parts , and probably less than 1/4 the labor time to modify the 241J to the 241OR spec , plus you get to sell the 241J transfer case that is desirable to the folks doing V-8 Chevy swaps .
Try searching on this site (The Search Button) , as I said before , there is a ton of information here that has covered all of the questions that you have asked , the information is there , your questions have been covered so many times that it's redundant to many of the people here trying to answer your questions .
Do the work , there is more than sufficient information to get you where you need to be .