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Old 10-08-2013, 01:41 PM   #1
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Swap a NV231 for an NP241OR - anyone ever do this?

I have a 2001 Sport with the NV231 and 3.73 gears. Obviously this means that my crawl ratio sucks, and it stalls really easy on the big obstacles. I was looking to regear, but I just bought lockers. With 3.73 and down gears, I cannot regear without buying a different locker. Since the Rubicon NP241OR is a simple bolt on, I figured I'd swap it out. My question is; Do I need to change the skid plate or is there any minor detail that anyone has run across that I'd need to watch for? (driveshafts, speedometer, skidplates, 4x4 shifter, sensors, or any other quirks I cannot think of)

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Old 10-08-2013, 02:08 PM   #2
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You can get thick cut gears that will work with your 3.73 down locker.

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Old 10-08-2013, 03:55 PM   #3
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I'm going to swap one in over the winter. From my research, you will have to deal with the following:
  • Speedometer
  • "massage" the tub so it will fit; especially if doing TT
  • Cable shifter
I'm not sure about the skid plate but I am going to do a belly up anyway. The 241 I bought already had the flange switched out for a yoke, so that's one less thing for me to do. Lastly, I'm not sure about the electronics.
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Old 10-08-2013, 05:45 PM   #4
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I read that the 241 is 2 inches longer than the 231 so shorter driveshaft, output flange might be different also.
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Old 10-08-2013, 05:53 PM   #5
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I'm not sure what the 231 measurements are but I just measured my 241 and it is approximately 17 1/4 inches front to rear.... from middle of yoke to middle of yoke is 14 3/4 inches... and the height on it is about 11 inches...
of course all measurements are approximate :-)
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Old 10-08-2013, 05:55 PM   #6
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and don't forget mine has yokes on both sides...


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Old 10-09-2013, 03:20 PM   #7
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Thanks everyone, I have been weighing my "bang for the buck" and decided to hold off on the x-fer case job for a bit. I will regear to 4.56 and bring my Jeep back to near stock power. The final drive ratio won't be as good as if I swap in the 241, but the gas/power balance will be better for the daily driving my Jeep gets tasked with. Later I will revisit the 241 swap.
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Old 10-09-2013, 04:54 PM   #8
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3.73 is on the correct side of the carrier break so you can regear lower (4.56, 4.88) without replacing the locker (or carrier).
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Old 10-09-2013, 05:57 PM   #9
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Quote:
Originally Posted by JFjeld View Post
3.73 is on the correct side of the carrier break so you can regear lower (4.56, 4.88) without replacing the locker (or carrier).
I believe the carrier break is 3.73 and numerically lower. However, numerically higher gears can be used if they are thick cut. At least thats what I understand with the D44, not sure about other axles.
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Old 10-09-2013, 06:11 PM   #10
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Quote:
Originally Posted by Surfturtle View Post
Thanks everyone, I have been weighing my "bang for the buck" and decided to hold off on the x-fer case job for a bit. I will regear to 4.56 and bring my Jeep back to near stock power. The final drive ratio won't be as good as if I swap in the 241, but the gas/power balance will be better for the daily driving my Jeep gets tasked with. Later I will revisit the 241 swap.
Remember the numerical ratio difference between the 231 and 241 is 1.28 (4-2.72). If say you are re gearing from 3.07 to 4.56 that's a difference of 1.49. You've effectively increased your crawl ratio more by re gearing than if you had stuck with stock gearing and swapped in a 241. And of course you get the benefits of better gears on road.

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