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Old 03-08-2012, 05:15 PM   #1
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4 low problem

Hi guys. I have the NP 231 Transfer case.. I was going to do a lil rock climbing in my back yard.. So I started up my Wrangler.. Put her to neutral and put it in 4 low.. Drove forward 10 ft and it poped out into neutral.. Did this a couple times from the short distance to the woods. Then kept poping out as i was driving down the hill into the woods.. Then I figured id Figure out what was going on so I turned around And headed back up the hill climb.. I was on the gas pretty good to get her up the rocky hill and It either.. Popd out hard! or.. Something broke.. Not sure ??? All i know is Now it wont go in at all.. And it feels like theres nothing there but i can feel it kinda grinding if i pull back Hard! And before it poped it felt like it was barley going in Couple weeks ago I put in a 1" body lift also..

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Old 03-08-2012, 05:19 PM   #2
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Did you look under the Jeep after you got it back up the hill?

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Old 03-08-2012, 06:10 PM   #3
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A glance.. What should I look for? I pretty much just post it up on here
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Old 03-08-2012, 06:18 PM   #4
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If you had both neutrals engaged at the same time at any point the gears tend to get out of wack and produce a terrible grinding noise. This happened to mine fresh out a used dealership and we thought the jeep was faulty but the dealership had it realigned within a couple hours. Never had both be in both neutrals at the same time
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Old 03-08-2012, 06:20 PM   #5
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I thought.. That you should have your tranny in neutral when shifting into 4 Low.. And you have to go threw neutral in the transfer to get to 4 low.. Right? Correct me were im wrong.
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Old 03-08-2012, 06:21 PM   #6
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I had this problem a while back ended up being my transmission mount torn in half replaced it and no more problem.Mine did exactly what you described. You may have to adjust you linkage after a body lift Im not sure.
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Old 03-08-2012, 06:29 PM   #7
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Right. I'm not sure what caused it, but I'm pretty sure when it popped back into neutral that's when things became misaligned. How fast were you going when it popped? And is your jeep running at all right now?
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Old 03-08-2012, 06:32 PM   #8
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I was going.. About one mile a hour.. Wheels spinning at about 10.. I'll check the Tranny mount tomorrow in the light. And I haven't adjusted the linkage after the body lift either! I'll check all the tomorrow. Thanks for the input guys
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Old 03-08-2012, 06:36 PM   #9
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Can you update this with whatever you find out happened? I'm interested to know if it's the same thing mine went through
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Old 03-08-2012, 07:23 PM   #10
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Just ordered a transmission mount.. Idk if thats the problem.. But we'll find out. I'll check the other recommendations tomorrow and let you know.
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Old 03-08-2012, 07:37 PM   #11
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I took mine in I thought it was the transfer case and he noticed it right away the bar across the top was gone and the rubber was shreaded and dry and dirty on 3/4 looks like it was barely hanging on for a while.4Hi would work but low wouldnt stay.When mine decided to go I was floored going up Blow Sand hill in 3rd and felt like I hit a land mine!!
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Old 03-08-2012, 07:58 PM   #12
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After re-reading your post I have one more question. Did you shift directly from 2wd to 4lo?
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Old 03-08-2012, 08:10 PM   #13
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I started my jeep... in 2 wheel.. Put it into neutral then pulled my transfer case shifter back threw 4 high N then to four low
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Old 03-08-2012, 09:05 PM   #14
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I haven't taken mine off roading yet so I'm not an expert when it comes to putting it into 4 lo. However I know that switching from 2wd to 4 hi is meant to be done in drive and from what I recall, I made the same mistake as you the first time I tried to shift- I put it in neutral and then switched to 4 hi and got an awful grinding when switching to 4 lo. 4 hi was meant to be done in drive while 4 lo was meant to be done in neutral
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Old 03-08-2012, 09:19 PM   #15
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And I'm pretty sure your supposed to get into 4 hi before shifting to 4 lo
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Old 03-08-2012, 09:25 PM   #16
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The proper way to put the t-case into 4wd is with the clutch in or transmission in neutral. While rolling forward (5mph or less), pull the transfer case lever back into 4wd. You can put it right into 4 low if you want to, from 2wd.

I roll forward in 1st gear at idle, slip it into neutral then move the 4wd lever into 4 low and push my shifter to first. By the time I have done all of this it normally slips right into 1st gear without using the clutch
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Old 03-09-2012, 04:07 PM   #17
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Took off the Tranny cover.. Looked down and when i moved the shifter around i could see that the front bolt had loosened.. making the shifter mount come loose.. So it wasn't moving right thus making the linkage not move enough. I'll get a pic of what i mean in a bit. I also ordered a new tranny mount cuz i noticed the tranny was shaking everywhere!
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Old 03-10-2012, 02:52 PM   #18
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I have a 89 with the 4.2 and auto trany mine isn't poping out of 4lo but its slipping. It works fine in 4hi but in 4lo the motor revs some before it starts pulling and it is making a roaring noise when in 4lo. What do yaw think?
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Old 03-10-2012, 10:09 PM   #19
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Ya got me.. But im sure someone else on here has herd of it before

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