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Unread 10-07-2013, 05:55 PM   #1
stovie
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242 to 249 swap??

I was wonder if a 249 could bolt right into my 97 jeep ZJ? I have the 242 right now but I'd like to get a 249, and it would be great if the 249 would bolt right on in place of the 242. I was also planning on keeping the 242 so if the vc goes bad I can swap them tell I get it fixed so that it doesn't hurt anything and then swap back.

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Unread 10-07-2013, 06:10 PM   #2
chadcmb
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why would anyone ever want to do that?

daily driver?
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Unread 10-07-2013, 06:19 PM   #3
stageninja
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Quote:
Originally Posted by chadcmb
why would anyone ever want to do that? daily driver?
I live in the snow belt so I prefer the 249. When, not if my VC goes I'll replace it. It really does make commuting on snow & ice doable.
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Unread 10-07-2013, 06:27 PM   #4
dave_dj1
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The 242 has full time 4 wd too when needed.
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Unread 10-07-2013, 06:41 PM   #5
Technohead
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Quote:
Originally Posted by dave_dj1 View Post
The 242 has full time 4 wd too when needed.
Full time in the 249 is far superior than full time in the 242.
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Unread 10-07-2013, 06:42 PM   #6
jeeepguy
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Quote:
Originally Posted by Technohead
Full time in the 249 is far superior than full time in the 242.
Please explain why...
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Unread 10-07-2013, 07:31 PM   #7
zj97ltd
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Wow this is like coming out the other side of a black hole... No one ever wants to swap IN a 249 lol. Although I really like mine.
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Unread 10-07-2013, 07:34 PM   #8
David97
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Just get any 249 out of any 96-98 ZJ and it'll bolt on. Not many people, at least as far as Ive seen swap from 242 to 249, so Id bet you could find one pretty cheap. Just dig around a little on Craigslist, local junk yards, etc.

Also check out this thread -> http://www.jeepforum.com/forum/f13/t...-np242-685644/ It'll have most if not all the information you need.
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Unread 10-07-2013, 07:42 PM   #9
newfieZJ
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You would need a 96-98 249 for an easy fit . Can be found in most 93-95 , but , 4.0 only . Output shaft must be .84" long . IIRC , there is a slight length difference in the 242's driveshaft vs the 249 . I'd have to guess 1" , it's been a while .

Buy a new VC if you are going to go through the swap . I love the 249 . Still run it in my 7+ lifted Orvis .
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Unread 10-07-2013, 10:55 PM   #10
Technohead
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Quote:
Originally Posted by jeeepguy View Post
Please explain why...
Because the 242 has an open differential which will leave you with one tire spinning in full time and the 249 has high bias limited slip (the viscous coupling) which will keep you moving.
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Unread 10-07-2013, 11:34 PM   #11
Timo_90xj
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Quote:
Originally Posted by Technohead View Post
Because the 242 has an open differential which will leave you with one tire spinning in full time and the 249 has high bias limited slip (the viscous coupling) which will keep you moving.
This exactly.

Try going up a snowy/ slippery hill with 242 in full time, then 249. On a daily driver in snowy areas, 249 is by far a better case compared to 242 or 231. Only downside is it's lacking 4hi part time or rwd if you need it.
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

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1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 10-08-2013, 01:25 AM   #12
stovie
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Yea that's part of the reason I'd like one! I got stuck in the river a few months ago, had it in 4wd and one tire was free spinning and because of that it wouldn't move. I'd also like to play around with some other things too like electric motors, and hydraulic regen braking ideas I have and it's best to have awd so that all four wheels are stopped together or you run the risk of sliding on the two wheels that are being stopped. Also would limited slip in front and rear be good or would lockers be better??
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Unread 10-08-2013, 01:46 AM   #13
Timo_90xj
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Having two tires and two not spinning has nothing to do with AWD, full time 4wd or part time 4wd. You need lockers + part time 4wd for all four corners to be permanently linked together.

The VC awd on the 249 can only provide 50/50 torque bias between front and rear, but it is never locked. On the 242 FT front and rear are not permanently connected either, it's full open center diff -> you may end up with only one wheel spinning in that mode without lockers.

With the 249 rear locker or limited slip is ok, in the front I'd only go with a selectable if you need all four tires pulling. I don't really see a need for that on a DD though.
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...

http://www.jeepforum.com/forum/f13/d...s-etc-1222317/


1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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Unread 10-08-2013, 09:19 AM   #14
PolkaPower
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