PLEASE HELP!!! NP231 transfer case install - JeepForum.com
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Unread 09-23-2013, 07:43 PM   #1
Jeepsterchick15
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PLEASE HELP!!! NP231 transfer case install

I'm an extremely stubborn young lady that likes to do my own work. Including removing and installing an np231 transfer case. I got the new one in, then realized I misplaced 3 of the bolts that mount the case to the transmission. I can't find anywhere online what size these bolts are... Wasted a free evening going back and forth to the parts store only to fail every single time. Can some one please enlighten me????

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Unread 09-23-2013, 07:55 PM   #2
superj
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Take one of the others to Lowe's or oriellys and go through the racks till you get a match.
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Unread 09-23-2013, 07:59 PM   #3
kloppk
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You lost the nuts or did you loose the studs?
They are metric....
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Unread 09-23-2013, 08:09 PM   #4
Jeepsterchick15
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Thanks for quick response. There was only three studs in the one I purchased used on eBay... Therefore I can't take them out :/ any other suggestions? I don't see why it's so hard to look up online?! I have the nuts from the other studs from my old t case. Feeling frustrated 😣
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Unread 09-23-2013, 08:11 PM   #5
Jeepsterchick15
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I took a nut to the parts store, but that bolt that fit the but is not big enough for the remaining holes... I would think if I bought a brand new t case it would come with new mounting bolts...which is why I "thought" it would be so easy to find online?
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Unread 09-23-2013, 08:18 PM   #6
jeep108
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Use the search bar and type in 'np231 mounting studs'
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Unread 09-23-2013, 08:26 PM   #7
mudsweatNgearz
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Take two of the nuts and screw em onto a stud. Use two wrenches and tighten the nuts against each other (simultaneously unscrewing the bottom one and tightening the other). When they are locked together REAL tight you should be able to unscrew the stud. Take that to Ace hardware and have them match the studs and nuts.
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Unread 09-23-2013, 08:32 PM   #8
JeepinJeremy
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threads should be M10x1.5 on the tcase flange. You'll probably need then 40-50 mm long if you want to just use a bolt
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Unread 09-23-2013, 08:38 PM   #9
Jeepsterchick15
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I would prefer just a bolt since I am an amateur mechanic �� I will try to find those bolts...wondering if they're usually in stock. Just ready to drive my jeep again!
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Unread 09-23-2013, 08:39 PM   #10
JeepinJeremy
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Ace Hardware stocks them all day long
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Unread 09-23-2013, 08:40 PM   #11
Jeepsterchick15
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Thank you! I will give that a try tomorrow!
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Unread 09-23-2013, 08:42 PM   #12
JeepinJeremy
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If by chance you have an older 231j threads will be 3/8x16. You never posted what year yj your working on or what year 231 case you swapping in.
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Unread 09-23-2013, 08:56 PM   #13
Jeepsterchick15
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It's a 1995 YJ, and both are the 231Js... Sorry I'm still learning haha! The bolt I brought home from the parts store (that fit the nut) was a 3/8-24... But is too small??
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Unread 09-23-2013, 09:25 PM   #14
imstillatwork
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Quote:
Originally Posted by Jeepsterchick15 View Post
It's a 1995 YJ, and both are the 231Js... Sorry I'm still learning haha! The bolt I brought home from the parts store (that fit the nut) was a 3/8-24... But is too small??
Studs often have two different threads on the ends, one thread for going into aluminum, a different thread pitch for the nut.
So you really need to know the thread pitch of the end that s in the case already.
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Unread 09-24-2013, 04:06 AM   #15
jeep108
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I forgot I have a np249 boat anchor sitting in my garage and I bet the studs are he same. I'll try to get one out.
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[QUOTE=Opihi59;14523519]Welcome to the forum.
If you are a mechanical neophyte and have to repetitively intone the mantra of "lefty loosey," are a mouth breather and only own a hammer, it will be more of a challenge. [/QUOTE]
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