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Thread: Help help np 231j

  1. #1
    Newbie KING-B's Avatar
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    Default Help help np 231j

    I have a 1990 YJ and installed the rough country 6" lift on it last night, I also ordered a new SYE, and a Tom Woods DS. After installation of the 6" lift we took the Transfer Case out and took apart to install new SYE. after we had the thing completely apart we noticed that the main spline shaft that was to be replaced was considerably smaller than the new one.. We double checked the serial numbers on the box and checked the order also. (this was the SYE from Rough Country that the Tech said was the correct one.) The numbers say its the right one. But something is not right ??? I have a NP231j on my jeep...and ordered the SYE 87-93YJ...Any ideas ....are there different 231's or did the RC send me the wrong stuff ???? any ideas would be big help.. I am currently driving w/o a rear drive shaft and had to reassemble my 231 and plug the end so no fluid leak and drive in 4wd for the time...
    "We are the people our parents warned us about"

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    By "smaller" do you mean the circumference of the shaft or the length?

  3. #3
    F it! It ain't my Jeep. Ricky Booby's Avatar
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    Did you try to installing it yet? Any issues besides "its considerably smaller?"
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  4. #4
    Newbie KING-B's Avatar
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    well here's what i have found out ...its a np231 early design and the and has the modified stock shaft (smaller) i have found some kits for a SYE but i was wondering if i could just mod the one i already bought...The Tom Woods driveshaft site has good diagrams
    "We are the people our parents warned us about"

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