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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Transfer Case Swap Info NP249->NP231 & NP242

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Unread 04-09-2013, 03:46 AM   #1561
ejschultz
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1997 ZJ 
 
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So you guys know, against your (and my) better judgement, I cut my rear driveshaft on the slip yoke when I did my swap this weekend. I took off about an inch and a quarter to an inch and a half. I did it the wrong way and didn't measure at all. I just eyeballed it. Some may say I got lucky. Others may say I'm an idiot for trying. It works. It doesn't bottom out at full droop and, although it'll probably never happen, at full compression of the rear suspension it doesn't drop. It's a perfect fit for my 242 and D44a. I also managed to do such a good job with a reciprocating saw, I don't even get any vibrations. All in all, I'd say I'm happy with the outcome.

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Unread 04-09-2013, 10:54 AM   #1562
90xjblue
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Hi guys, just looking for a confirmation on the compatible years of tcase.

I have a 1990 xj and a 1991 xj both auto both have 231 tcases.

My 1990 has a sye in the tcase, i want to swap that into my 91, the whole case to avoid tearing it apart and moving sye. I have been told the input shafts to the tranny changed from 21 to 23 in 1991 but this thread contradicts that.

So is it a direct swap or will i need to pull out the input shaft or sye and swap it into the 1991 case?

thabjs
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Unread 04-11-2013, 10:05 AM   #1563
Mark-318-IT
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1998 ZJ 
 
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Location: Desenzano del Garda (BS), Italy
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hi guys, finally, tomorrow i'm installing the 242...now i have to ask you a question: with the 249 to engage 4lo i have to go very slow (like 4-5 km/h) put in N and pull back the leverage while the car is still moving. With the 242 is it the same story? do i have to go very slow, put in N and pull back the tcase's leverage? or can i do it wihle the car is stopped?
car is 98 limited 318
thanks guys
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Unread 04-11-2013, 10:15 AM   #1564
Freestyle713
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Quick question, which cases share the same main shaft as the early np231? I'm thinking of getting one to get rid of my hack n tap sye and put my old driveshaft back in to see if my vibes go away.
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[B]94 Grand Cherokee 5.2[/B] [SIZE="1"]33in. Federal Couragia M/T's on Procomp Steelies, np231 swap, IRO Hack n Tap SYE, Carolina Driveshaft, 4.5 in. lift, RE front upper/rear lower ca's, RC front lowers, Ironman rear uppers, IRO 4.5 coils in rear, 3.5 and 2" bb (no isolators) in front, Bilstein 5100's, Clayton/JKS adj. track bars, KOR rad support and SS, Magnaflow/Flowmaster exhaust, clear corners, custom light bar w/ Hella 500's[/SIZE]

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Unread 04-11-2013, 10:30 AM   #1565
ejschultz
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Anytime you shift any transfer case into 4 low, you need to be going 0-3 mph, preferably not 0, with the vehicle in neutral. This holds true for every NP/NV transfer case I've ever encountered across all makes.
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97 ZJ - 5.2L, 242, 4" IRO lift w/short arms & adj. TBs, JKS Discos/BPEs, DT3000s, Aussie'd 44A, sliders, OEM skids/hooks/hitch, 31" Duratracs on 15x8s
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Unread 04-11-2013, 11:00 AM   #1566
Mark-318-IT
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Quote:
Originally Posted by ejschultz View Post
Anytime you shift any transfer case into 4 low, you need to be going 0-3 mph, preferably not 0, with the vehicle in neutral. This holds true for every NP/NV transfer case I've ever encountered across all makes.
understood thanks, and what about the 2wd--->4wd part time? and from 4wd part to 4wd full?
thanks
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Unread 04-11-2013, 11:07 AM   #1567
ejschultz
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According to the manuals, not over 55 mph. Anything under that should be okay, assuming the transfer case is in good working order. I don't like switching at speeds much above 40. There really shouldn't ever be a need to though. That being said, I found my Nitro will shift from 2 wheel drive to 4 hi at 75 mph. I wouldn't recommend doing it though.
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97 ZJ - 5.2L, 242, 4" IRO lift w/short arms & adj. TBs, JKS Discos/BPEs, DT3000s, Aussie'd 44A, sliders, OEM skids/hooks/hitch, 31" Duratracs on 15x8s
14 JKU Sport S - Stock
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Unread 04-11-2013, 11:27 AM   #1568
comptiger5000
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Also, when shifting 2hi/4ft/4pt, you have to be going STRAIGHT. I find it's best to shift while coasting, and then very, very lightly apply throttle to unload the driveline, and it should go right in.
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Unread 04-11-2013, 11:43 AM   #1569
Mark-318-IT
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10.4 thanks for all these infos...so in the end: going straight, not over 55 and tranny in N (i'm talking about HI gears, not 4lo). Right? thanks again
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Unread 04-11-2013, 11:49 AM   #1570
ejschultz
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The tranny doesn't need to be in neutral. Sometimes if the driveline has tension, neutral can help, but you shouldn't necessarily have to.
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97 ZJ - 5.2L, 242, 4" IRO lift w/short arms & adj. TBs, JKS Discos/BPEs, DT3000s, Aussie'd 44A, sliders, OEM skids/hooks/hitch, 31" Duratracs on 15x8s
14 JKU Sport S - Stock
Build
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Unread 04-11-2013, 12:04 PM   #1571
Mark-318-IT
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Quote:
Originally Posted by ejschultz View Post
The tranny doesn't need to be in neutral. Sometimes if the driveline has tension, neutral can help, but you shouldn't necessarily have to.
good to know, thanks again
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Unread 04-12-2013, 09:06 AM   #1572
caroedell
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1997 ZJ 
 
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I was lucky enough to find a 1992 242J case for $90.00. It was even rebuilt and in excellent condition. Even though produced on January 15, 1992, it has the 23 spline input. I understand this would require a front case swap as the input bearing size and planetary gear cut are different. Has anybody done a work up on the front case swap? It looks as if I need to swap the shift fork positioner and the transfer chain gears. Since the 249 has a solid front output shaft with drive gear, they would have to be switched as well.
So how much of a difference is it to leave the original .750" input shaft as opposed to the .840? This is getting to a big pain already
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Unread 04-15-2013, 09:48 PM   #1573
knower
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1997 ZJ 
 
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Hi guys!

I have found a np231j transfer case from a 1997 TJ.
Would this be good to replace the NV 249 that is on my ZJ 1997?


Thanks very much!
G.
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Unread 04-16-2013, 12:50 PM   #1574
leadfootny
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1996 ZJ 
 
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Kudos to the OP for the write up. Just did this swap in my 5.9. I was able to use my rear d/s with the 242. The one out of my 96 was way too short, plus the rear u-joint too small. I have about an inch left on the rear output shaft. Pulling out of my driveway (which is the most amount of flex this Jeep will do), it didn't bottom out so I think I will be good. The 249 is ISY and the 242 is ESY.
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Unread 04-17-2013, 08:45 PM   #1575
chetzar
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1994 ZJ 
 
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Location: Bloomington, Illinois
Posts: 126
Anyone know if Jr. is still around? I'm tried to PM him, but his inbox is full...
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