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Old 02-04-2013, 05:26 PM   #1
Join Date: Jun 2012
Posts: 128
Transfer case np231 problems

Hey, I've had a problem with my jeep vibrating lately and took it too the mechanic today and they said the output that turns my rear driveshaft is messed up, and for a new one it will be 750 dollars plus 150 labor for anouther one. They said it couldnt be rebuilt but he also admitted too not knowing alot about jeeps, i called a shop that rebuilds transfer cases and he said it would be 150 too rebuild my transfer case, i plan too have the jeep towed home for now and removing my transfer case and taking a look at it, do you guys think it could be rebuilt? It was still driving fine other than the vibration, its going too stay parked for now of course, also im looking for a transfer case on craigslist, will any no 231 j work or does it have too come off the same kind of transmission?
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Old 02-04-2013, 10:01 PM   #2
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Any help?

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Old 02-04-2013, 10:13 PM   #3
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Posts: 86
Is it lifted? If it is you should put a sye kit on the t case as well. You will need a new dc drive line tho, but that combo will lengthen the drive line and that will help with future vibrations wearing out the new shafts.
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Old 02-04-2013, 11:42 PM   #4
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It is lifted 3 inches, i never had vibrations before (think its been lifted for around 40 thousand miles now) i somehow did this while offloading the other week.
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Old 03-31-2013, 03:30 PM   #5
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Yes i agree you need an SYE installed, if the transfercase is damaged find one on craigslist, the are not overly complicated, however you have to make sure the one you acquire comes out of the same # of cyl engine and auto or manual trans.
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Old 03-31-2013, 04:26 PM   #6
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I agree that installing an SYE would be a good way to go if you want to spend the $'s, but be aware that it requires new driveshaft, adjustable upper control arms, and track bar/bracket. I just did it to mine and the cost was right around $1400 for the hardware (new). I did the labor myself. If your budget is tight, you may want to just pull it, and see what kind of condition the output shaft bearing is in. You might find a bad bearing or a spun race, and maybe just need to replace bearing or bearing and output shaft housing.

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