np242 question - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 23 Old 03-31-2014, 08:49 PM Thread Starter
jimbone007
Registered User
1998 ZJ 
 
Join Date: Jul 2012
Location: thompson
Posts: 215
np242 question

Hey Guys Im thinking of buying a zj for my Wife.The one Im thinking of buying has the np242 tcase in it.I have a zj with the 249 and a xj with 231 so I know how well they work, My question is:
does the 242 operate like a 249 and 231 combine basically? or Is it not comparable ? I want my wife to be able to have 4wd all time for bad weather days but she wants the option to use 2wd for better mpg but I want to know that this tcase will operate as well as the 249 and 231.Thanks Guys

jimbone007 is offline  
Sponsored Links
Advertisement
 
post #2 of 23 Old 03-31-2014, 08:51 PM
tucsonzj
Registered User
2000 TJ Wrangler 
 
Join Date: Jul 2012
Location: 42.127628
Posts: 2,857
you wont get better mpgs. all gears are still turning in all 3 cases just no power is sent when in 2wd, not to mention it's a steel tank that has 0 aerodynamics.

His:00 TJ "Fiona" stuff/stuff/stuff
95 ZJ 3.5" w/242 swap-Sold
Hers: 15 JK Sahara-3" Teraflex
tucsonzj is offline  
post #3 of 23 Old 03-31-2014, 09:08 PM Thread Starter
jimbone007
Registered User
1998 ZJ 
 
Join Date: Jul 2012
Location: thompson
Posts: 215
haha true. I dont care about the mpgs really Im Just wondering if the 249 is better than the 242 for 4wd all time or they are pretty close. Same with the 4hi and 4lo in the 231 compared to the 242. In other words is the 242 the best of both worlds?
jimbone007 is offline  
post #4 of 23 Old 03-31-2014, 09:12 PM
tucsonzj
Registered User
2000 TJ Wrangler 
 
Join Date: Jul 2012
Location: 42.127628
Posts: 2,857
Quote:
Originally Posted by jimbone007 View Post
haha true. I dont care about the mpgs really Im Just wondering if the 249 is better than the 242 for 4wd all time or they are pretty close. Same with the 4hi and 4lo in the 231 compared to the 242. In other words is the 242 the best of both worlds?
Stick with the 249 if you're not considering things like front locker etc. Search around the forum there's lots of info but in your case probably not worth the swap unless there's a problem with your current case

His:00 TJ "Fiona" stuff/stuff/stuff
95 ZJ 3.5" w/242 swap-Sold
Hers: 15 JK Sahara-3" Teraflex
tucsonzj is offline  
post #5 of 23 Old 03-31-2014, 09:15 PM
ZJfamilyfun
Registered User
1998 ZJ 
 
Join Date: Mar 2013
Location: Alpena
Posts: 172
I love my 242's. Had one in my 88 xj then swapped our bad 249 for a 242. Works flawless. 2wd on dry pavement and gravel when I want to have fun. 4 full time in snowy weather and even wet roads. It gets annoying spinning tires at stop lights and stop signs with the v8. Lol...I even use 4 full time on the trails until I get into the real poop. But mainly because I use 4lo a lot and 4 full time is just the other side of N. Lol....call me lazy. Go for it. You won't regret.
ZJfamilyfun is offline  
post #6 of 23 Old 03-31-2014, 09:17 PM
ZJfamilyfun
Registered User
1998 ZJ 
 
Join Date: Mar 2013
Location: Alpena
Posts: 172
Quote:
Originally Posted by jimbone007 View Post
haha true. I dont care about the mpgs really Im Just wondering if the 249 is better than the 242 for 4wd all time or they are pretty close. Same with the 4hi and 4lo in the 231 compared to the 242. In other words is the 242 the best of both worlds?
The VC in your 249 will eventually fail. The 242 won't. So yes imo the 242 is the best of both worlds.
ZJfamilyfun is offline  
post #7 of 23 Old 03-31-2014, 09:26 PM
Zjrookie
Registered User
1998 ZJ 
 
Join Date: Feb 2014
Location: Las Vegas
Posts: 193
I will vouch 242 is worth it my 249 went bad and just swapped in the 242 and I am way happier
Zjrookie is offline  
post #8 of 23 Old 03-31-2014, 09:31 PM Thread Starter
jimbone007
Registered User
1998 ZJ 
 
Join Date: Jul 2012
Location: thompson
Posts: 215
Ok Thanks for the replies guys. Sounds like I might buy this ZJ If its in good shape and eventually Ill try to find a 242 to swap my 249.
jimbone007 is offline  
post #9 of 23 Old 03-31-2014, 11:13 PM
CatSplat
Registered User
1994 ZJ 
 
Join Date: Jul 2009
Location: Calgary
Posts: 1,391
With a properly functioning viscous coupler, the 249's 4FT will outperform the 242's 4FT, no question. In good working order, the 249 is a very good full-time AWD case. If you need or want the selectable 4PT but also drive in situations where 4FT is a benefit (i.e. a multipurpose street/trail rig) the 242 is a solid compromise.

1994 5.9L ZJ, retrofitted UC package, NP242 swap, 17" JK Moabs with 32" BFG MT KM's.
The Jeep of Theseus
CatSplat is offline  
post #10 of 23 Old 04-01-2014, 03:31 AM
tucsonzj
Registered User
2000 TJ Wrangler 
 
Join Date: Jul 2012
Location: 42.127628
Posts: 2,857
Mind you all of this leads up the fact that the 231 is the best of the 3 cases in terms of simplicity inside and has the best track record of not being picky between the 3 cases. You have a 98, so the VC in your case is different then the VC you'll see in the 93-95 249 cases which fail much quicker. But as Catsplat said, the 249 for all time 4wd will out perform the other 2 cases hands down. Not to mention it is the strongest case with the thickest chain of the 3. All have their ups and downs, so going to what depends on your needs, options and wants. As part of this, the 93-95 249 was a split 50/50 case, meaning half the power went upfront and half went out back 100% of the time. While the 96-98 249 case is about 10/90, with 10% power going to front, 90% going to rear until it senses a slip in the tires and then it adjust the power to both wheels.

I love my 249, snowy winter I just get in and go, no concerns and I have 200k on that case without a VC replacement. At the same time mine is starting to show slight signs of wear so I'm prepping for a swap so I'm prepared when that time does come.

There's a lot of negative talk around here about the 249 cases, but they are excellent cases, extremely durable and work. They just have that fatal flaw of the VC that will fail usually between 100k-250k. Parts usually run about 300 to fix it when it goes out, and many people say for less than that cost I can get a 242 or 231 and swap it in.

My .02, if my VC is still strong, and it's a DD that I have 0 desire to lock the front and want to have all time 4wd, I would not swap out the 249. Again, this is if there are no issues with the case. If/when a problem does arise, then it's a question of cost to repair vs cost to swap. But as said for all time 4wd you can't beat the 249.

Sorry for my lazy responses last night, was late and knew I had to be up at 4am haha

His:00 TJ "Fiona" stuff/stuff/stuff
95 ZJ 3.5" w/242 swap-Sold
Hers: 15 JK Sahara-3" Teraflex
tucsonzj is offline  
post #11 of 23 Old 04-01-2014, 04:23 AM
jay-h
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2006
Posts: 5,082
I got a ZJ with 242 for my wife. Maybe it's just my Wrangler mindset, but I feel more comfortable with the 3 manually selected choices (+low)

[I wouldn't have turned the deal down if it was a 249, but this was closer to my preference]

My toys
'89 Wrangler YJ
'47 CJ2-A

wife's toys
97 Grand Cherokee (ZJ)
87 MB 560SL roadster
jay-h is offline  
post #12 of 23 Old 04-01-2014, 04:58 AM
Technohead
Old School
 
Technohead's Avatar
1998 ZJ 
 
Join Date: Dec 2008
Location: Exeter, RI
Posts: 7,346
Quote:
Originally Posted by jimbone007 View Post
haha true. I dont care about the mpgs really Im Just wondering if the 249 is better than the 242 for 4wd all time or they are pretty close. Same with the 4hi and 4lo in the 231 compared to the 242. In other words is the 242 the best of both worlds?
Its not the best of both worlds. The 242 uses a sprocket differential for full time 4wd which behaves like an open differential. Very frustrating to be sitting there in the snow with one tire spinning. The 249 uses a viscous coupling for full time 4wd which behaves like a limited slip. Step on the gas and go. World of difference.

Most viscous couplings of the ZJ vintage are now worn out and need replacing. Its a $300-$400 unit.
Technohead is offline  
post #13 of 23 Old 04-01-2014, 06:52 AM
nnovickzj
Registered User
1997 ZJ 
 
Join Date: Oct 2013
Location: wareham
Posts: 128
i have a 242 that i use during the summer and every year (after the first when i used the 242 after the swap)i go through the hassle of putting the 249 back in. i do it because its so much better in snow and ice and i dont have to worry about anyone else who might drive it messing something up.

97 zj 5.2 40,000mi
locked front and rear, 242, 3.5 iro lift, 32x11.5 kenda klever, 28 laredos for the road
4x 130 watt 6" spots on the roof rack, h3 leds in stock fogs, 2 40w leds on the grill
nnovickzj is offline  
post #14 of 23 Old 04-01-2014, 07:05 AM
FiveThirty
Registered User
1998 ZJ 
 
Join Date: Mar 2014
Location: Rock Hill
Posts: 16
I see a lot of 98ZJ owners in here so I'll ask. My problem now is with the drive shaft. The donor 242 has an ESY and of course the 249 is a ISY. From what I've read, my original drive shaft is going to be too long. Mine is a Limited with an upcountry lift and I plan to put a BB on it or something later anyhow. I did some measuring from where the t-case bolts to the trans to the end of the main shaft and then on the bolt to the end of the main shaft of the 242. Both are 19" but I think that's just going to end up with me being snug and having no slip room. On the other hand the donor shaft I pulled looks substantially shorter. I guess I won't know until I get stuff mounted and see how it fits.

For the OP's consideration:

I just bought my 98 5.2 Limited and am looking at a VC going bad. Long story but I looked for an older ZJ rather than the WJ I was originally looking for because I could come out under budget by half and have money left over for repairs/mods. Anyways, the VC was a known issue going into it and I waffled for a while whether to replace the VC or do a 242/31 swap.

For me it was a simple issue of going to a more desirable case and doing it much cheaper than the cost of a VC (last I looked around $340 from a decent seller on EBay). I pulled a 242 from the junk yard for $115. It feels tight and I don't think I'm going to do a rebuild until I get it mounted and see that there is a problem rather than spending the money now. I know it's probably the fool's way but we'll see how it goes. In the case that you have to rebuild the 242 you pull, a rebuild kit is around $100-120. Now the drive shaft. I paid $20 for the donor drive shaft and was unlucky enough to end up with one thats got some dents in it. I couldn't find anymore ESY drive shafts from a selec trac, in fact the 242 we pulled was the only one we found in the whole yard. That being said, unless I can scrounge up another DS that will fit, I'm going to have to retube this one assuming it's the one that will fit. That's another $150 (rough estimate I have no idea what it'll cost). So consider my case when making your decision. If I come out of this WITHOUT a rebuild I'll have spent $285 if I have to retube my DS + about $20 in core charges. If I have to rebuild the 242 I'll come out spending probably $405. So as you can see it's not always the cheaper option. I really hope this drive shaft thing works out. Anyone else know of other DS's I could look for at the yard? Another $20 beats the **** out of retubing the donor or getting my original shortened.

Last edited by FiveThirty; 04-01-2014 at 07:06 AM. Reason: spelling
FiveThirty is offline  
post #15 of 23 Old 04-01-2014, 07:08 AM
PolkaPower
Registered User
1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss
Posts: 19,374
No comparison between the 242 and 249 full time. 249 is superior. Your wife will love how temperamental shifting the 242 is.
PolkaPower is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome