Transfer cases and their interchangeability [Archive] - Dodge Durango Forum

: Transfer cases and their interchangeability


4Lo
06-03-2009, 01:31 AM
what year did the dakotas switch from a manual t-case to shift on the fly?? My truck is an 03 and she is shift on the fly. I'd like to install a manual t-case and want to know if other years are a bolt in or not.

alwaybroken
06-03-2009, 02:06 AM
There should be a tag on the back of the case.
I would think it's a standard 6 bolt pattern 23 spline input.

4Lo
06-03-2009, 02:56 AM
yup np233. What model does 97 andup use??

ColoDak
06-03-2009, 03:02 AM
the model year switch IIRC is '00/'01

HemiDak
06-03-2009, 09:25 AM
the model year switch IIRC is '00/'01

That is correct.

4Lo
06-04-2009, 12:53 AM
so what manual t-case will replace my auto t-case? Will np242 bolt up? Didn't daks use the np242 up to the 00/01 model year split??

Trouble Maker
06-04-2009, 01:27 AM
so what manual t-case will replace my auto t-case? Will np242 bolt up? Didn't daks use the np242 up to the 00/01 model year split??
231 is part time 4wd with manual shift.

233 is part time 4wd with electric shift.

242 is part/full time 4wd with manual shift.

243 is part/ full time 4wd with electric shift.

HemiDak
06-04-2009, 04:23 AM
231 is part time 4wd with manual shift.

233 is part time 4wd with electric shift.

242 is part/full time 4wd with manual shift.

243 is part/ full time 4wd with electric shift.

Well said--you know your stuff.

Although I do have one addition to your post...

The 242/243 cases are made in two different variations. One of them has full-time and part-time, while the other has full-time, part-time, and a 2wd option as well.

alwaybroken
06-04-2009, 04:50 AM
Is the bolt pattern the same as a 231?
and whats the input spline of a 233?

HemiDak
06-04-2009, 05:04 AM
They're all the same since they were used on the same transmissions.

devilsdodge
06-04-2009, 05:32 AM
what do you guys mean part/full time. i had a 242 in my zj. same thing as that.just not sure what you mean by it.

HemiDak
06-04-2009, 05:56 AM
what do you guys mean part/full time. i had a 242 in my zj. same thing as that.just not sure what you mean by it.

Full-time 4wd (aka AWD) means you can use it anytime you want. Part-time 4wd (aka 4HI LOCK) means you can use it during times of low traction.

The difference between them is that full-time 4wd has an open differential in the transfer case that allows 4wd to be used, but also allows differentiation between the two axles for street use.

Part-time 4wd bypasses the center differential and locks both driveshafts together, which makes street driving impossible unless you're an idiot who can ignore horrible grinding sounds.

devilsdodge
06-04-2009, 06:15 AM
i must be over looking something here thats all. i had a 242 in my jeep.it was 2wd,4 full time,4 part,neutral, & 4 lo... does the dak 242 have the same features?id assume it did.& is it possible to bolt one up (manual) if i cut the floor? mines got the 233 in it now.would i benefite(sp) at all?

Trouble Maker
06-04-2009, 06:54 AM
i must be over looking something here thats all. i had a 242 in my jeep.it was 2wd,4 full time,4 part,neutral, & 4 lo... does the dak 242 have the same features?id assume it did.& is it possible to bolt one up (manual) if i cut the floor? mines got the 233 in it now.would i benefite(sp) at all?
The earlier Dak 242 t-case had the 2wd position on it's shifter. When they went to the electric shift 243 they did away with the 2wd position.

Having owned a V8 Jeep ZJ with the 242 (installed it myself) there was virtually no mileage difference between 2wd part time/4wd full time since like the Daks everything turned all the time anyway but handling, especially in winter, was better in 4wd full time so it spent most of it's time there anyway. The 2wd option was nice for sliding on corners and scaring the wife though.:D

I wish the wife's Dak had the 243 in it because she doesn't really understand when you should use part time 4wd and it would be easier on the truck (and my nerves) if I didn't have to worry about her using it when she shouldn't. For 99% of her driving the 4wd full time position would be perfect and I may install a 243 if I can get a deal on one.

4Lo
06-05-2009, 12:49 AM
So I should be looking for an np242 then??

Trouble Maker
06-05-2009, 01:28 AM
So I should be looking for an np242 then??If you want or need the full time option.

The 231 is considered to be a stronger t-case though and there is more aftermarket support for them than there is for the 242.

HemiDak
06-05-2009, 03:48 AM
If you want or need the full time option.

The 231 is considered to be a stronger t-case though and there is more aftermarket support for them than there is for the 242.

The 231 being a stronger case depends on who you talk to. The 242 has a larger case, which typically represents a stronger case and internals.

Just some background transfer case info for you to know...

1. The first number designates the number of gear ranges (most of them being 2-ranges (4HI and 4LO), yet some of them have only one range). NV2XX

2. The second number designates the case size, which typically has a direct relation with the strength and use of the transfer case. NV23X, NV24X, & NV27X

3. The third number designates how the transfer case is actuated (shifts). NV231, NV233, NV242, NV243

4Lo
06-05-2009, 03:55 AM
why or when would i need the full time option though??

devilsdodge
06-05-2009, 04:18 AM
full time like having awd you can have it in all the time just like 2wd.i used that mode alot in my jeep when the road were really bad in the winter.& part time i used only when i really needed 4 wheels drive & 4lo i never used.

Trouble Maker
06-05-2009, 05:31 AM
2. The second number designates the case size, which typically has a direct relation with the strength and use of the transfer case. NV23X, NV24X, & NV27X


This applies more to the later New Venture models since the mid 90s or so and doesn't encompass the earlier New Process models such as the 203, 205 & 208.


3. The third number designates how the transfer case is actuated (shifts). NV231, NV233, NV242, NV243

Doesn't hold true in all cases like the 247, 249 and a few others.

HemiDak
06-05-2009, 07:39 AM
This applies more to the later New Venture models since the mid 90s or so and doesn't encompass the earlier New Process models such as the 203, 205 & 208.

Since we're not living in the 80's and 90's anymore, those models have little relevance to us anymore. ;)

Doesn't hold true in all cases like the 247, 249 and a few others.

It actually does if you know your transfer case terminology like I do. ;)

Trouble Maker
06-05-2009, 08:49 AM
Since we're not living in the 80's and 90's anymore, those models have little relevance to us anymore. ;)

Actually some do since the 231/242 have been in use since the early 80s and though they are similar there are differences both internally and externally that make a difference when sourcing parts for replacement or upgrading. It is best to be aware of these similarities and differences so you don't get burned when buying something that "should fit" because the numbers are the same.



It actually does if you know your transfer case terminology like I do. ;)I know what they stand for also but it is not whether they are shifted manually or electrically in this instance.

:stirthepoThose of you that think you know it all are annoying to those of us that do.:funny:

devilsdodge
06-05-2009, 12:27 PM
so your saying you think you know it all also?

alwaybroken
06-05-2009, 12:56 PM
:waiting:

ColoDak
06-06-2009, 02:48 AM
why or when would i need the full time option though??

having full-time (AWD) is nice anytime. You'll always have traction, you don't have to worry about whether or not you need 4wd. I've done a lot of serious off-roading and never gone into hi or lo lock on mine. Hell, the blizzard we had in '06/'07, 3ft of snow from one 36 hr storm, I was out transporting emergency personel, I was in 4hi (AWD mode) the entire time making my own roads and dodging portable snow drifts. Never once need lock.

Trouble Maker
06-06-2009, 05:21 AM
so your saying you think you know it all also?Not anymore, as I get older I have relinquished that title to my children, just like my dad did to me during my teen years.:funny:

4Lo
06-06-2009, 05:51 AM
It looks as though that there is a fair amount of aftermarket suport for the np231 as well. Short shaft kits 4:1 kits and I like that there is a kit for a vss. This would come in handy for the sas swap. :mullet:

HemiDak
06-06-2009, 07:00 AM
Actually some do since the 231/242 have been in use since the early 80s and though they are similar there are differences both internally and externally that make a difference when sourcing parts for replacement or upgrading. It is best to be aware of these similarities and differences so you don't get burned when buying something that "should fit" because the numbers are the same.

I was talking about the models I quoted like the 203, 205, & 208. ;)

I know what they stand for also but it is not whether they are shifted manually or electrically in this instance.

Since the topic of this thread is about putting a manual case into a truck made for an electronic case, this thread is indeed about the compatibility between the two. ;)

:stirthepoThose of you that think you know it all are annoying to those of us that do.:funny:

I get that a lot, and it still makes me laugh every time I read it. ;)

4Lo
06-07-2009, 07:56 PM
anybody else have an opinion?? Anybody here ever swapped t-cases before? I'll possibly be looking at doing this swap in the fall/ winter. Ima guessing ima gonna loose part of my factory console to cut through the trans tunnel to allow for the shifter.

alwaybroken
06-08-2009, 05:49 PM
If you have the money get a atlas transfer case..
If you want a stock transfer case i would go 231.
should bolt right up.

Trouble Maker
06-09-2009, 01:28 AM
anybody else have an opinion?? Anybody here ever swapped t-cases before? I'll possibly be looking at doing this swap in the fall/ winter. Ima guessing ima gonna loose part of my factory console to cut through the trans tunnel to allow for the shifter.
You could go with factory pieces from an earlier year for the shift assembly and use factory parts and pieces to cover all the holes.

Or you could use the universal shifter that Novak sells http://www.novak-adapt.com/catalog/kit_sk2x.htm . I had one of their shifters in my 93 Jeep ZJ with the 5.2/242 and it shifted way more positive than the factory linkage.

4Lo
06-09-2009, 02:55 AM
So np 231 (part time) or np 242 (full time)?? Both will bolt in to an 03 dakota correct?? I like the full time option of the 242 but I know the 231 will bolt in without issue. What is the overall opinion of you dakota owners who regularily wheel their trucks??

ColoDak
06-09-2009, 03:01 AM
I've never had a problem in all the times I've wheeled mine, one thing I will say though, is that you do get too confident with the AWD. I've come close to biting off more than I could chew because I was too confident in the AWD and got into something that I should have been in lo loc to get through and ended up getting stuck.

4Lo
06-09-2009, 04:10 AM
NP 242 came in the ZJ and the XJ. Looks like they came with 21 spline count vs the 231 which is a 23 spline count. Am I repeating info already posted??

I am leaning towards the 231. It looks like I am going to have to start pricing out a 231.

Can anybody tell me again which years and models vehicles fit the Dakota?? ie jeep to dodge etc.

NorCal_Dakota
06-09-2009, 05:57 PM
Most of them should fit, the difference will be the length of the input gear/slip yoke.. I have swapped between my truck, my XJ's, and a awd ZJ. All were the same, except the input gears. I have a spare input actually, so if you find one and it's not from a dodge PM me. Don't worry about the 4x4 light/shifter, another thing to look for would be to find one from a jeep and then use the speed sensor on the tcase when you swap the rear axle.

Kevin

4Lo
06-10-2009, 06:07 AM
What input are you using on the 231 (if out of a jeep)for the Dakota, a dakota one?? Sorry for the questions but I know very little on the subject.:sorry:

Trouble Maker
06-10-2009, 07:07 AM
What input are you using on the 231 (if out of a jeep)for the Dakota, a dakota one?? Sorry for the questions but I know very little on the subject.:sorry:
If the input is a different length you could probably use the input from your 233 in the 231 since other than the electric shift it is basically the same t-case. Be aware that there was a slight change in the gear cut angle in the planetary section of the New Process/New Venture cases in about 95 or so and your input will not work with the pre 95 cases.

4Lo
06-13-2009, 11:26 PM
Be aware that there was a slight change in the gear cut angle in the planetary section of the New Process/New Venture cases in about 95 or so and your input will not work with the pre 95 cases.


I won't be shopping for a pre 2000 case so that won't be an issue thanx for the info though. I am pretty sure I can use the input out of my 233 if the 231 is different.

PitViperRT
09-29-2009, 03:16 AM
In this whole thread no one said any thing about the NV244 full time case used in the 02-03's .It's AWD (haha)really FWD until wheel slippage is senced then kicks in the rear through a slip/lock diff in case. Or switch to 4H and lock all 4. 2L for crawling and Nuetral.:funny:

Sarge6479
10-20-2009, 03:11 PM
If I have the 231 now in my durango could i "upgrade" to the 242 with minimal modification?

4Lo
10-26-2009, 06:19 AM
Found a t-case out of a 2000 model year dakota. Guy wants 500 bones canadian for it...yeesh but the tag says 231D. What does the "D" stand for??

http://vancouver.en.craigslist.ca/pml/pts/1435694468.html

4Lo
03-02-2012, 04:50 AM
Bump.

I still want to do this swap. Now that the axle swap is done this is the next step for me. Currently my front output is a cv and I want to run a yoke. The front driveshaft is bolted up with those lousy 6 metric screws and that is the weak link in my drivetrain. I am actively looking for a np231.

Trouble Maker
03-02-2012, 05:09 AM
Bump.

I still want to do this swap. Now that the axle swap is done this is the next step for me. Currently my front output is a cv and I want to run a yoke. The front driveshaft is bolted up with those lousy 6 metric screws and that is the weak link in my drivetrain. I am actively looking for a np231.You could just change the yoke to one of the more common yokes. The 231/233/242/249 t-cases from Dodge/Jeep all use the same spline on the front output. I know when I swapped the 249 in my Jeep Grand Cherokee I used the yoke from my 249 on the 242 that I swapped in so I didn't have to screw with the front driveshaft. IIRC the NP 208 used in the older Dodges/Jeeps may also use the same spline.

4Lo
03-02-2012, 06:37 AM
So help me out here. To eliminate the front cup output, any newer model jeep/ chrysler front output from the cases you listed will swap then.

Trouble Maker
03-02-2012, 12:12 PM
So help me out here. To eliminate the front cup output, any newer model jeep/ chrysler front output from the cases you listed will swap then.
Yes. Your Jeep'n buddies probably have several in their parts piles that you could choose from.

NorCal_Dakota
03-02-2012, 03:17 PM
So help me out here. To eliminate the front cup output, any newer model jeep/ chrysler front output from the cases you listed will swap then.

I may have a yoke for you in my garage, I will look later.

Kevin

4Lo
03-02-2012, 03:58 PM
From what I understand there are different chain and bearing sizes that affect which year and model are a direct swap. How do I tell what size chain I have inside my case?

4Lo
03-02-2012, 10:53 PM
I may have a yoke for you in my garage, I will look later.

Kevin

Let me know and we'll figure out price and shipping

NorCal_Dakota
03-14-2012, 01:13 AM
No luck with the 2nd one, but this is the one off my truck that has the np231

http://i20.photobucket.com/albums/b215/kthrash/IMG_0342.jpg

http://i20.photobucket.com/albums/b215/kthrash/IMG_0341.jpg

4Lo
03-14-2012, 01:30 AM
Will that fit my NP233??

Here is some info on Dodge T-Cases. That is the front yoke in that pic correct? It looks like a 27 or 28 spline.

NorCal_Dakota
03-14-2012, 02:20 AM
Will that fit my NP233??

Here is some info on Dodge T-Cases. That is the front yoke in that pic correct? It looks like a 27 or 28 spline.

Yes, front yoke. 26 spline.

Not sure if it fits. I can get any other measurements if you want to compare to yours.

The D in 231D stands for Dodge, 231C is chevy, 231J is jeep

http://i20.photobucket.com/albums/b215/kthrash/IMG_0340.jpg

4Lo
03-14-2012, 03:51 AM
Well the only way to know for sure is to remove the cup. My truck is coming off the road for a week or so soon for some misc shit so I will pull it then. I will check locally first and if I don't find anything then I will let you know.

Trouble Maker
03-14-2012, 05:43 AM
Should fit, the 233 is just the electric shift version of the 231.

NorCal_Dakota
03-14-2012, 04:35 PM
Well the only way to know for sure is to remove the cup. My truck is coming off the road for a week or so soon for some misc shit so I will pull it then. I will check locally first and if I don't find anything then I will let you know.

I can't sell this one, but at least you can verify spline count.

fing qc
04-22-2012, 05:29 AM
anybody know if the 4 to 1 gears for a 231 will work in my electric shift 233?

Trouble Maker
05-14-2012, 04:50 AM
You could just change the yoke to one of the more common yokes. The 231/233/242/249 t-cases from Dodge/Jeep all use the same spline on the front output. I know when I swapped the 249 in my Jeep Grand Cherokee I used the yoke from my 249 on the 242 that I swapped in so I didn't have to screw with the front driveshaft. IIRC the NP 208 used in the older Dodges/Jeeps may also use the same spline.
I was wrong. :huh:

242/249 and 208 front outputs are 32 spline and larger than the 26 spline 231/233 front output shafts.

231 shares the same spline count/shaft size as a D44. D300 are supposed to be the same but don't have one here to verify that fact.

McBride73
05-08-2013, 03:00 AM
If I have the 231 now in my durango could i "upgrade" to the 242 with minimal modification?
take a look at the ID tag on your t-case, if it's a 231HD, it pretty much is a 242, i swapped my 231 out for a 231hd(with modification)