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Old 02-09-2011, 12:48 PM
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4 high not working

Hey guys, I tryed searching but came up empty handed. Can anybody tell me a reason my 4 high all of a sudden dosent work? 4 low works great but just no 4high. It's an 05 tj sport 6speed 4" lift and 33's. If I'm not giving enough info just tell me what you need to know and I'll do my best to get it.

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Old 02-09-2011, 12:50 PM   #2
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ya im having the same problem, but my 4 high is slipping? 1999 Wrangler 2" lift 32's..... Help?

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Old 02-09-2011, 12:53 PM   #3
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did either of you install anything recent to the problem? Only input i have is check your linkage....hmmm ill try and find the writeup on that in a little
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Old 02-09-2011, 12:55 PM   #4
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what do you mean by install anything recent?
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Old 02-09-2011, 12:55 PM
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I haven't done anything to mine in almost 6 months unfortunately.
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Old 02-09-2011, 12:57 PM
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I think he means like a lift or a tcase drop. Right?
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Old 02-09-2011, 12:59 PM   #7
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anything drive line wise, a body lift over 1" causes linkage problems
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Old 02-09-2011, 01:00 PM   #8
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oh ok, but lift kit was out on about a year ago and i had to replace my transfer case, got one from a junk yard with low miles maybe connection between the two?
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Old 02-09-2011, 01:01 PM   #9
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Brodtz, ide have to say your slipping out of 4hi is a sign of a larger problem, but ide wait to see what some of the more seasoned guys say.
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Old 02-09-2011, 01:03 PM   #10
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Quote:
Originally Posted by Brodtz View Post
oh ok, but lift kit was out on about a year ago and i had to replace my transfer case, got one from a junk yard with low miles maybe connection between the two?
Did you have it rebuilt before it was installed?
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Old 02-09-2011, 05:02 PM
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Quote:
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Brodtz, ide have to say your slipping out of 4hi is a sign of a larger problem, but ide wait to see what some of the more seasoned guys say.
A larger problem as in what?
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Old 02-09-2011, 05:48 PM
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I really hope i dont have to take it to the dealership for this. I cant even imagine what that would cost me.
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Old 02-09-2011, 05:54 PM   #13
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Quote:
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4 low works great but just no 4high.
Are you sure you are actually in four low, or just going off the wow I can only do 25 in 5th gear so I must be in four low. do you get the binding when you turn on a hard surface in four low? It sounds like something with the gears transferring power to the front wheels might be wrong.
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Old 02-09-2011, 05:55 PM   #14
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I really hope i dont have to take it to the dealership for this. I cant even imagine what that would cost me.
cost me $1400 to have the seals replace because it was leaking (transmission).
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Old 02-09-2011, 06:07 PM
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Ive never had it in 4lo on a dry surface. Just offroad or in the snow.
Heres the story of what happened to make me think its not working. It snowed a crazy amount here in southwest missouri the last 2 weeks, so i go to pull out of my garage and that goes good then i go to pull forward. I can feel it start spinning then it just seemed like the front quit, no pop snap or boom, so i get out to look and couldnt see anything wrong so i get back in and asked my girlfriend to watch and see if the front tires were spinning. They werent. so i put it in 4lo and they started working like they should, i got unstuck and went on my way. That was last week and it still isnt working in 4hi. I get around in 2wd just as easy.
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Old 02-10-2011, 08:42 PM
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thanks to those of you that responded to my question. i still havent figured out what the problem is, so it looks like im going to sign my life away at the dealership.
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Old 02-10-2011, 08:53 PM   #17
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Let me know what the dealership says, I am having the same problem with my 94. I am probably wrong but I believe that our np231 t-cases have a viscous coupler that allows the front axle to have some slip in it for driving on slippery pavement when in 4 high. And when in 4 low it locks the front and rear axle together that bot have to spin at the same time. The viscous couple has a stronger pull when it heats up similar to the clutch fan in on our water pumps. I had the same problem in the snow as you so I was wondering if it wasn't heating up due to the extreme cold. I am probably wrong in this as I am unsure and I don't know how to fix it. but I believe that's how they work. please someone correct me if I am wrong because I would like to understand the problem myself
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Old 02-10-2011, 08:57 PM   #18
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I think you can at least self diagnose the problem. From your description you are getting 4LO and confirming that it spins the wheels. In 4HI you do not get the front wheels to move. That's a good start. It means that when in 4LO you are definitely turning the front but in 4 HI you are definitely NOT turning the front. You have eliminated a broken front driveshaft and any of the axle parts in the front. Now lets look at the Transfer case: Are you SURE that when you shift to 4HI that the linkage is not slipping and leaving you in 2HI? Is your 4wd light illuminated? Does the shift from 2HI to 4HI seem easier (like less resistance or a slip of the linkage?). I doubt you have a major TC problem... sounds like linkage to me. A major TC issue and you would hear all sorts of hollering in the gearbox.
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Old 02-10-2011, 09:11 PM   #19
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I more I have been reading the more I believe that the NP231 does not use a viscous coupler. So disregard my rambling
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Old 02-12-2011, 12:11 PM
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Capndean this is the type of answer i was looking for because it gives me a great place to start. Thank you for that. Ive never owned a 4x4 so this stuff is all greek to me. Coming from a sport car back ground, where if your wheels dont spin under power youve got a major problem, i automatically assumed i was S.O.L. Thank you again. Now when it comes adjusting the linkage how difficult is it? What do i need to look for to make sure it gets all the way engaged? i probably should have searched these questions before asking, but im at work and dont have time to on my short break that i get. Thanks in advance

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