transfer case number off of 2006 CRD

racertracer · **Posted:** Thu Nov 15, 2018 11:58 am

I need a new transfer case.

The previous owner changed it with a lower gear ratio.

The dealer parts department indicated that the original model number of the transfer case was a 231.

The previous owner swapped to a 242 J.

Anyone know why he would swap it?

Also, I'd like to compare model numbers off of your transfer case ..... what Model number is on your transfer case?

BTW, The Miles per gallon on this CRD are terrible, could this be the cause of it?

CRD05LIBERTY · **Joined:** Fri Jun 01, 2018 4:16 pm **Posts:** 20

i believe its a 242 that should have came with the CRD

Sir Sam · **Posted:** Thu Nov 15, 2018 5:29 pm

The 242 is the only transfer case that came in US CRDs. If in doubt get your build sheet.

The only way the change gearing is to get an aftermarket kit for the low range.

If you need a new transfer case any 242 from a KJ will work. The gassers mostly came with the 231. The 241 came behind manual trans, don’t get this one either.

I think the WJ 242 will work fine as well, and the XJ 242 will work with a few changes, but it would be easier to get a KJ 242.

Good luck, there are plenty of them out there and they are not particularly expensive.

racertracer · **Posted:** Thu Nov 15, 2018 5:37 pm

Sam, I appreciate the response.

The parts guy was wrong and you are right, my build sheet indicates that I need a 242 and not a 231.

I have a 242 from a donor vehicle on the way, available and inexpensive.

Thank you

Sir Sam · **Posted:** Thu Nov 15, 2018 10:03 pm

racertracer wrote:

Sam, I appreciate the response.

The parts guy was wrong and you are right, my build sheet indicates that I need a 242 and not a 231.

I have a 242 from a donor vehicle on the way, available and inexpensive.

Thank you

Good to hear.

dac44444 · **Posted:** Fri Sep 13, 2019 1:01 pm

Are we Positive any year 02-07 242 Select Trac TC will work, Gas or Diesel?

geordi · **Posted:** Fri Sep 13, 2019 9:40 pm

The CRD has a 242J transfer case, the only difference MAY be the low range ratio, IIRC it is 2.35:1. The high range is 1:1.

For what it is worth, I believe the gassers also had the 242J. The 241 case WILL work, however it lacks the fulltime setting. I ended up with one of those after the high range imploded on a trip, and the boneyard THOUGHT that they had a 242... It wasn't correct b/c the owner of the wreck must have swapped it at some point just like I had to do. It worked for the trip, and then I had to get another (correct) case for the CRD. Now I have that as a paperweight and 2 more 242J cases that have been "inherited" from various projects.

casm · **Joined:** Sun Jan 29, 2006 5:05 pm **Posts:** 694

geordi wrote:

The CRD has a 242J transfer case, the only difference MAY be the low range ratio, IIRC it is 2.35:1. The high range is 1:1.

AFAIK, the low range ratio used on the NP242 in the KJ is the same as in the other Jeeps that used it - 2.72:1.

Quote:

For what it is worth, I believe the gassers also had the 242J. The 241 case WILL work, however it lacks the fulltime setting. I ended up with one of those after the high range imploded on a trip, and the boneyard THOUGHT that they had a 242... It wasn't correct b/c the owner of the wreck must have swapped it at some point just like I had to do. It worked for the trip, and then I had to get another (correct) case for the CRD. Now I have that as a paperweight and 2 more 242J cases that have been "inherited" from various projects.

Are you sure that NP241 isn't an NP241OR? If it is, it should have the 4:1 low range from the TJ Rubicon.

If it was a 'regular' 241, I believe that those were used in GM vehicles. No idea as to how easily those would interchange with a Jeep, however; could be a case of changing tailcones and output shafts (or something else entirely).

65Corvair · **Posted:** Fri Sep 13, 2019 10:39 pm

Based on the parts catalog, it doesn't list any specific engine options to the 242 transfer case, so I would assume it's good to go.

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geordi · **Posted:** Sat Sep 14, 2019 4:18 am

casm wrote:

geordi wrote:

The CRD has a 242J transfer case, the only difference MAY be the low range ratio, IIRC it is 2.35:1. The high range is 1:1.

AFAIK, the low range ratio used on the NP242 in the KJ is the same as in the other Jeeps that used it - 2.72:1.

Quote:

For what it is worth, I believe the gassers also had the 242J. The 241 case WILL work, however it lacks the fulltime setting. I ended up with one of those after the high range imploded on a trip, and the boneyard THOUGHT that they had a 242... It wasn't correct b/c the owner of the wreck must have swapped it at some point just like I had to do. It worked for the trip, and then I had to get another (correct) case for the CRD. Now I have that as a paperweight and 2 more 242J cases that have been "inherited" from various projects.

Are you sure that NP241 isn't an NP241OR? If it is, it should have the 4:1 low range from the TJ Rubicon.

If it was a 'regular' 241, I believe that those were used in GM vehicles. No idea as to how easily those would interchange with a Jeep, however; could be a case of changing tailcones and output shafts (or something else entirely).

I'll buy that 2.72:1 ratio, sounds good to me. My number was just a fuzzy memory guess. As for the 241 case, it matched the physical appearance perfectly, fit exactly... Just didn't have the full-time position OR the NP241 tag to tell me precisely what it was. I couldn't tell you if it was an OR version or not - I don't think it was 4:1 though, that would be a CRAZY low range. My use of it was just in the 1:1 range, I only tested the positions after it was installed, but I was in the middle of nowhere Louisiana and had to get to Texas on that trip... So I wasn't too concerned about what range it had.

It was solid though, no crunchy noises like the case that had dropped the high range on me on an off ramp! When that one was cracked open... Mmmmm, yummy steel oatmeal all up in there. Dumped that sucker in the scrap heap.

65Corvair · **Posted:** Sat Sep 14, 2019 9:24 am

From all the reading I have done about transfer cases, the 241J is just a more robust version of the 231J. The 241J was available on 2005-2007 Liberty with the 3.7 and 6 speed manual transmission.

Source:http://dodgeram.org/tech/specs/tranfer_case.htm

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Josh P · **Joined:** Fri Aug 09, 2019 3:20 pm **Posts:** 15

The NV242 HD from a V8 WJ is a stronger version of the 242 J and would retain the full time mode.

casm · **Joined:** Sun Jan 29, 2006 5:05 pm **Posts:** 694

Josh P wrote:

The NV242 HD from a V8 WJ is a stronger version of the 242 J and would retain the full time mode.

If you want to go for one with serious beef, look for an NP242 (I forget the exact designation) from a Hummer H1 or HMMWV. It adds a much wider chain (over 1", IIRC), oil pump, and external oil cooler.

Having had Jeeps with both the NP231 and NP242, I'm a huge fan of the NP242; the selectable centre diff is just so damned useful. Wish they had left the factory with the option of 4-low full-time, but if wishes were horses and all that.

Strangely enough, this is actually one reason why I've never been desperate to put an NP241OR in any of mine - it's a good case and having the 4:1 low range would let you pull down houses, but I know that I'd get more use out of the centre diff than the low range.

Josh P · **Joined:** Fri Aug 09, 2019 3:20 pm **Posts:** 15

casm wrote:

Josh P wrote:

The NV242 HD from a V8 WJ is a stronger version of the 242 J and would retain the full time mode.

If you want to go for one with serious beef, look for an NP242 (I forget the exact designation) from a Hummer H1 or HMMWV. It adds a much wider chain (over 1", IIRC), oil pump, and external oil cooler.

Having had Jeeps with both the NP231 and NP242, I'm a huge fan of the NP242; the selectable centre diff is just so damned useful. Wish they had left the factory with the option of 4-low full-time, but if wishes were horses and all that.

Strangely enough, this is actually one reason why I've never been desperate to put an NP241OR in any of mine - it's a good case and having the 4:1 low range would let you pull down houses, but I know that I'd get more use out of the centre diff than the low range.

Great unit if you are willing to give up 2wd. The WJ 242 HD has a 1.25 inch chain.

casm · **Joined:** Sun Jan 29, 2006 5:05 pm **Posts:** 694

Josh P wrote:

Great unit if you are willing to give up 2wd. The WJ 242 HD has a 1.25 inch chain.

IIRC (and it's been over a decade since I've seen one of the Hummer NP242s, so could be misremembering), 2WD was only blocked off at the shifter. It's still available as long as you use a different shift gate for the transfer case.

racertracer · **Posted:** Sun Oct 06, 2019 8:53 pm

I have a low mileage 242J transfer case for sale.

transfer case number off of 2006 CRD

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