Transfer Case Swap Info NP249->NP231 & NP242 - Page 228 - JeepForum.com

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post #3406 of 3412 Old 06-14-2017, 09:09 PM
Photog2000
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Quote:
Originally Posted by kg6mov View Post
You will need to have your rear shaft shortened as a 98 231 is ESY.

Other than that it will bolt up fine.
Thats fine. When I do finally get around to installing it I will add a SYE anywasy and right now I dont even have a front shaft

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post #3407 of 3412 Old 06-14-2017, 09:56 PM
kg6mov
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Then you'll be good to go.

I don't know why you'd throw an SYE on there though.


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1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

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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 #3408 of 3412 Old 06-19-2017, 10:58 AM
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Lucky Me!

Guess it's good to live in a place with lots of ZJ's. Went down to the local U-pull'em. Snagged a 242, rear drive shaft, u-joint front axles and replacement cv front drive shaft and a bonus factory skid plate for $200. Looks like my life is gonna be easy. Everything came from a '96 and a '98 ZJ. I own a '97, this swap should go like butter.

1997 ZJ, 185,000 miles young. 318 V8. Bone Stock.
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post #3409 of 3412 Old 06-19-2017, 11:12 AM
Eugnton
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yep.

Quote:
Originally Posted by kg6mov View Post
That's not a linkage issue then, it's a feature of the 242.

Mismatched tires will make it worse, and fresh fluid may help.

Common wisdom is to drive a few feet in reverse then pop back to drive and go forward again, that will usually pop the case back to 2wd.
It is not wisdom, it is the direct instruction from the owners manual. I had a 97 XJ with 242, owners manual specifically instructed to move from FT 4wd to 2wd while driving in reverse, approx 12'. In my experience you will hear it happen.

1997 ZJ, 185,000 miles young. 318 V8. Bone Stock.
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post #3410 of 3412 Old 06-19-2017, 11:42 AM
Eugnton
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Originally Posted by JrMechanic View Post
4hi and 4 part time are the same thing. The 242 has an added 4 full time feature that can be used on road. The 242's full time system doesn't even hold a candle to a properly working 249. Also, you should be able to shift into 4 low with the Jeep off. If the drive train is loaded (on an incline) it won't shift into 4 low.
Having now owned 3 different Jeeps (2 XJ's and now a ZJ) with all 3 transfer cases, I prefer the 242. When the weather gets crappy out, you can put the 242 in full time for weeks, like I did while living in a place where they don't plow. You cannot do that with the 231. Having the ability to use 4hi when 4lo is not needed is a big bonus when crusing around in the mountains, you can get around at a non crawling speed and slip it into 4lo when you need a little help moving up and down the steep stuff.

I just picked up everything needed, plus bonus parts, to do the swap at my local u-pull 'em for under $200. The easiest option was to spend $350 on a new VC.

I am taking the opportunity to upgrade and improve. Plus I like 2wd. I have heard it does not make much difference on the mileage, but I got 20 mpg in the XJ and am currently getting 16 mpg in the ZJ. I would think it would improve especially since I am driving 80 miles a day round trip to work every day.

1997 ZJ, 185,000 miles young. 318 V8. Bone Stock.
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post #3411 of 3412 Old 06-19-2017, 12:51 PM
BorderWalker
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Originally Posted by Eugnton View Post
I have heard it does not make much difference on the mileage, but I got 20 mpg in the XJ and am currently getting 16 mpg in the ZJ. I would think it would improve especially since I am driving 80 miles a day round trip to work every day.
The XJ is also a smaller curb weight than the ZJ, which means the 4.0 is having to work harder. 16MPG in a ZJ is actually pretty good.

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post #3412 of 3412 Old 06-19-2017, 01:10 PM
kg6mov
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2wd makes 0 difference in mileage. An XJ is not an apples to apple comparison.


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1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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