Transfer Case Swap Info NP249->NP231 & NP242 - Page 71 - JeepForum.com
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Unread 02-08-2012, 07:22 AM   #1051
csouers
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My 242 ESY swap on my stock 5.9 required rear dshaft work. We took an inch off.

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Unread 02-08-2012, 10:23 AM   #1052
2GPS4ME
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This is why I chose to go with the 231. The measurements are identical.

But the 242 is a nice TC, though....
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Unread 02-26-2012, 02:41 PM   #1053
elkski
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Before I read all 71 pages of this.. Why does one want to change out TC's?? I have a 93 GC 5.2
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Unread 02-26-2012, 02:46 PM   #1054
KingtheZJ
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Quote:
Originally Posted by elkski View Post
Before I read all 71 pages of this.. Why does one want to change out TC's?? I have a 93 GC 5.2
blown viscous coupling in a 249 causing binding on turns. 242s and 231s are abundant and cheap
or, the ability to run a front automatic locker on pavement. or smoother operation having a rear automatic locker.
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Unread 02-26-2012, 03:00 PM   #1055
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Originally Posted by KingtheZJ View Post
blown viscous coupling in a 249 causing binding on turns. 242s and 231s are abundant and cheap
or, the ability to run a front automatic locker on pavement. or smoother operation having a rear automatic locker.
Don't forget improved fuel mileage, stronger components, the ability to do 2wd burnouts, better traction offroad.


So to summarize


BETTER, BETTER, BETTER, BETTER, BETTER, BETTER, BETTER
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Unread 02-26-2012, 03:06 PM   #1056
KingtheZJ
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Don't forget improved fuel mileage
any reports of increased mileage are negligible. front axle still spins w/o lockout hubs. no overall increase
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Originally Posted by cttandy View Post
stronger components
the 249 has the highest torque rating
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the ability to do 2wd burnouts
i'll agree with this!
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Unread 02-26-2012, 03:09 PM   #1057
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any reports of increased mileage are negligible. front axle still spins w/o lockout hubs. no overall increase
I wouldn't call jumping from 13.5MPG to 18.5MPG negligible. I tried everything I could before swapping the TC. The results were worth the effort.

Granted, there was probably a lot more problems under the surface.
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Unread 02-26-2012, 04:26 PM   #1058
E-rok
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I wouldn't call jumping from 13.5MPG to 18.5MPG negligible. I tried everything I could before swapping the TC. The results were worth the effort.

Granted, there was probably a lot more problems under the surface.
I swapped in a 242 and run 2WD for the most part and found no noticeable gain in MPG.

unless you have disco hubs, its not going to make much diff.
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Unread 02-26-2012, 04:29 PM   #1059
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Originally Posted by cttandy View Post
I wouldn't call jumping from 13.5MPG to 18.5MPG negligible. I tried everything I could before swapping the TC. The results were worth the effort.

Granted, there was probably a lot more problems under the surface.
i had 0 gain from the swap. you definitely had something else going on.
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Unread 02-26-2012, 05:13 PM   #1060
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x2 i didn't gain any mpg at all doing my swap

Actually lost a bit because i'm skinny pedal happy now drifting it around corners
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Unread 02-26-2012, 07:10 PM   #1061
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Before the swap, when I took my foot off the gas to coast, the jeep would just start stopping. Afterwards, it would coast great, even if I put it in full time 4wd it would still coast.

By the end, the 249 was only putting power to the front wheels. Made for some pretty awesome front wheel drive burnout's though.
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Unread 02-26-2012, 07:13 PM   #1062
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Then your 249 was screwed far worse than a bad VC, or your tires weren't matched front to rear (or the pressures were noticeably different).
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Unread 02-26-2012, 08:49 PM   #1063
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OK im in the middle of the input shaft change. I turned the gear in the big fork around a couple times... not sure which way is toward the tail shaft. I am guessing that the thinner side goes toward the tail shaft. Can someone confirm this?
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Unread 02-26-2012, 09:08 PM   #1064
Dyn0mitemat
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Your description left me clueless as to what your talking about, get a picture of what parts your talking about

There's not much in the cases that can be installed backwards, most likely if you can bolt it all together and run the shifter through the modes and everythings turning like it should you probably won't have a problem
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Unread 02-26-2012, 09:43 PM   #1065
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Quote:
Originally Posted by moldeck View Post
OK im in the middle of the input shaft change. I turned the gear in the big fork around a couple times... not sure which way is toward the tail shaft. I am guessing that the thinner side goes toward the tail shaft. Can someone confirm this?
The low range (lower of the two forks) hub goes with taller portion facing down into the input assembly. The hub should be pretty much level with the fork once installed.

The mode sleeve goes with the taller portion and teeth facing up towards the rear of the case.
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