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Unread 07-07-2014, 03:42 AM   #1
travisyoung
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Transfer case swap.....

Now before yall jump down my throat I have done a lot of research and i think that is my problem haha.

Ill give a little background. I have a 94 gc limited 5.2 auto. After long highway driving trying to pull into a parking spot my jeep jumps and tires squeal soo that makes me think the vc is on the way out. Am i wrong?

So as far as i have read that i should get the 231 or 242?

So iv read that the input shafts matter? And there is different gear cuts? And the only way to tell is to pull it and measure it? Theres no way to tell by a serial number?

Im on a budget So which one to go with? Tbh if i wheel I'm going to be on trails in the sierra Nevadas and local mud holes. So which one? I would like to not to have to mess with DS well getting them redone but i can handle SYEs.

What else would i need to upgrade? Axles?

Im on a 2" bb lift but wont be surprised if i get up to 3-3.5.

So lets recap haha

1 Is the VC bad?

2 How to tell which input shaft and gear cut do I have?

3 what upgrades are needed?

4 Which year and T case should i get?

I know this is a beat to death topic but iv looked and am still confused. Thanks for the help and patience for a noob!

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Unread 07-07-2014, 04:17 AM   #2
kg6mov
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1: Yes.
2: Gear cut is by year "Rule of thumb is cases with a build date of pre 94.5 will have the old style gear cut." Shaft length is also year, you should have a 1.55" input shaft.
3: Depends on the case and what you want to do with it.
4: Just replace the VC, overall the 249 is a much better case. If you really want to wheel the snot out of it then a 231 is the better choice for simplicity and ground clearance.
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Unread 07-07-2014, 04:24 PM   #3
Glued2aPost
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Quote:
Originally Posted by kg6mov
1: Yes. 2: Gear cut is by year "Rule of thumb is cases with a build date of pre 94.5 will have the old style gear cut." Shaft length is also year, you should have a 1.55" input shaft. 3: Depends on the case and what you want to do with it. 4: Just replace the VC, overall the 249 is a much better case. If you really want to wheel the snot out of it then a 231 is the better choice for simplicity and ground clearance.
Hated my 249. I wanted a 242 for the full time high option for snow and rain (5.9 problems), 2wd for dry and highway cruising and locked tcase for off road. With the 249 I've been in 4lo, up to the rockers in mud while the front wheels sat motionless and the rear wheels spun uselessly. No such problems with the 242..

A new VC is expensive. Putting one in is tedious. If your jeep is a daily driver, swapping in a 242 can be done in an afternoon. Changing the VC can be a full day affair.
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Unread 07-07-2014, 05:25 PM   #4
Technohead
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Quote:
Originally Posted by Glued2aPost View Post
Hated my 249. I wanted a 242 for the full time high option for snow and rain (5.9 problems), 2wd for dry and highway cruising and locked tcase for off road. With the 249 I've been in 4lo, up to the rockers in mud while the front wheels sat motionless and the rear wheels spun uselessly. No such problems with the 242...
You are clueless. The 249 is superior to the 242 in all respects. Under normal conditions its essentially 2wd. Only when it senses slip in the rear does the VC send torque to the front. This behavior is similar to a limited slip. By way of comparison full-time in the 242 behaves like an open differential. Its very frustrating to be sitting there in full time 4wd with ONE wheeling spinning. The 249 locks front-to-rear in 4lo.

All above comments apply to 96+ 249's The 93-95 249's which do not lock front-to-rear in 4lo ranks as one of the biggest failures in the history of Jeep.
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Unread 07-07-2014, 06:04 PM   #5
travisyoung
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So i have the **** transfer case sense i have a 94?
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Unread 07-07-2014, 06:58 PM   #6
MKCoconuts
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Quote:
Originally Posted by travisyoung View Post
So i have the **** transfer case sense i have a 94?
Pretty much. I just swapped my 249 for a 242. I never had a problem with the 249, but I like having the 2wd option now, makes for much more fun in wet weather. I'd sell you my 249, but it's out of a '97 so the input and the gear cut are wrong.
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Unread 07-07-2014, 07:48 PM   #7
94cherry
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I have a 94 and 95 zj the 94 had the 249 but the VC went bad so I swapped in the 242. I love it, its great to be able to chose what mode im in instead of the all time.
The 95 4.0 had a 231 that the gears and chain went bad in so I swapped for another 242 and it performs great also.
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Unread 07-07-2014, 08:14 PM   #8
Glued2aPost
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Quote:
Originally Posted by Technohead
You are clueless. The 249 is superior to the 242 in all respects. Under normal conditions its essentially 2wd. Only when it senses slip in the rear does the VC send torque to the front. This behavior is similar to a limited slip. By way of comparison full-time in the 242 behaves like an open differential. Its very frustrating to be sitting there in full time 4wd with ONE wheeling spinning. The 249 locks front-to-rear in 4lo. All above comments apply to 96+ 249's The 93-95 249's which do not lock front-to-rear in 4lo ranks as one of the biggest failures in the history of Jeep.
The 249 doesn't sense anything. It's mechanical. If the front and rear driveshafts are spinning at different speeds it builds up friction in the VC which causes power to go to the front drive shaft. In my first ZJ, a 98 limited, I had one wheel spinning in 4lo. Even in the 5.9 I have now with a completely shot VC, there were situations where only the rear tires were spinning in 4lo. It didn't seem to lock. Supposed to, probably, but it didn't. The 242 gives you the option to lock in 4hi and 4lo, and 4 hi full time works great with a limited slip. The jeep drives much better in 2wd also.

There is no arguing cost though. 242s go for $250. A new VC is $350 plus the hassle of taking it apart.
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Unread 07-07-2014, 08:31 PM   #9
travisyoung
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Does a 242 need new drive shafts?
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Unread 07-07-2014, 08:36 PM   #10
94cherry
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Quote:
Originally Posted by travisyoung View Post
Does a 242 need new drive shafts?
Depends on the year, newer 242/249 are external slip yokes and older ones are internal. Find the year of yours. Look for the tag on your TC then report back to us. Also read this closely.
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Unread 07-08-2014, 03:21 PM   #11
travisyoung
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Idk what all these mean, how can i telll?
image-3898220683.jpg

image-4096464509.jpg

image-102660682.jpg

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Unread 07-08-2014, 04:19 PM   #12
94cherry
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The build date is April 18 1994 by looking at the serial number. Find a 242 or 231 that is a 93 to 6/94 then do the front shaft swap. t is an easy job.
Read this thread.

http://www.jeepforum.com/forum/f13/t...-np242-685644/
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Unread 07-08-2014, 05:51 PM   #13
travisyoung
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Quote:
Originally Posted by 94cherry
The build date is April 18 1994 by looking at the serial number. Find a 242 or 231 that is a 93 to 6/94 then do the front shaft swap. t is an easy job. Read this thread. http://www.jeepforum.com/forum/f13/t...-np242-685644/
Thanks!

I have read that one more than once its a lot of info to take in at once haha
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Unread 07-08-2014, 06:04 PM   #14
94cherry
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When I did my swap I read the whole thread. Took me 4 hours.
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Unread 07-08-2014, 09:51 PM   #15
travisyoung
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Quote:
Originally Posted by 94cherry
When I did my swap I read the whole thread. Took me 4 hours.
Damnnn haha i better start reading
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