NP231 and front CV? - JeepForum.com
 
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post #1 of 5 Old 06-09-2016, 03:43 PM Thread Starter
kb9mfd
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NP231 and front CV?

I have a 95 zj, 4.0 auto with a NP242 I put in it so I can use the full time during the winter. I'm not a trail guy so I'm not that demanding on the drivetrain. (would not mind some trails but I don't know of any within 200 miles from here) Anyway, I am getting a 93 zj 4.0 factory 5-speed (one of those rare factory 5-speeds). It has a NP231, and the previous owner changed out the front u-joints with cv joints because he said it solves the binding issue in 4wd. My question is, is that actually true, does it still bind but just not noticeable. Would I be better off putting a NP242 in that zj also or because its a manual and has the cv, it does not bind in 4wd if you are on dry pavement. I was thinking about swapping them and I don't know if it would be worth it. Thanks!

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post #2 of 5 Old 06-09-2016, 04:09 PM
kg6mov
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Those are very different uses of the word "bind".

When you say CV I assume you mean the axle shafts? CV axle shafts will bind and hop less than u-joints when turned in 4wd. That doesn't mean that you can use it on the street like the one wheel drive of the 242 4ft.

So yes, CV don't bind at the axle shaft in 4wd, but they still bind the drivetrain if you put it in 4wd on the street.


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1984 F250, 460 BB, T19, work truck/future tow pig
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I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #3 of 5 Old 06-09-2016, 05:43 PM Thread Starter
kb9mfd
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Quote:
Originally Posted by kg6mov View Post
Those are very different uses of the word "bind".

When you say CV I assume you mean the axle shafts? CV axle shafts will bind and hop less than u-joints when turned in 4wd. That doesn't mean that you can use it on the street like the one wheel drive of the 242 4ft.

So yes, CV don't bind at the axle shaft in 4wd, but they still bind the drivetrain if you put it in 4wd on the street.
That is what I thought but was just making sure. I'll probably just get another 242 as they are not too expensive. I hope the output shaft of the AX15 is the same as the 42RE or I'll have to take them apart and swap the input shafts as I do not believe those ever came with a 242 on them.
I know from experience that if you put it in 4pt on dry pavement it has difficulty getting out of it. I have to either rock it back and forth for a while or jack up the back to relieve the pressure. Sometimes it even gets stuck on the 242 passing threw it going from 4ft to 2ft. Thanks!
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post #4 of 5 Old 06-09-2016, 06:29 PM
kg6mov
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Note that the difficulty getting out of 4pt on pavement is a 242 feature, it doesn't apply to the 231.


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I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #5 of 5 Old 06-09-2016, 06:49 PM Thread Starter
kb9mfd
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Originally Posted by kg6mov View Post
Note that the difficulty getting out of 4pt on pavement is a 242 feature, it doesn't apply to the 231.
Ya, I've heard that before. I wish they made the sequence 2 - 4ft - 4pt, that would make more sense. Just noticed your call, glad to see I'm not the only one that uses their call as a screen name. Use to have a 6 call but them moved to the Midwest. Thanks!
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front axle , manual transmission , transfer case

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