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  #1  
Old September 6th, 2005, 22:40
Hayden Hayden is offline
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NP231 converting to NP242

I have a 98 XJ that I am wanting to take original NP231 out of and swap in the NP 242 so that I can have the full time option. I know for the most part it is a direct bolt in. My question is for anyone who has done it, what does it take the change the wireing so the "full time" light will come on? I am trying to make this look as factory as possiable. I know there is a location for the full time light but im not sure if there is actually a bulb in it or not. I would also assume the switch on the T-case uses a different plug for the indicator wires. If anyone has any insight on this I would appericiate any help.


Thanks
Hayden
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  #2  
Old September 7th, 2005, 06:27
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JLane99XJ JLane99XJ is offline
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Re: NP231 converting to NP242

are you planning on doing a hub conversion?

i don't really understand why anyone would want to do that..

i'll take that 231J off your hands if the price is right, bob
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  #3  
Old September 7th, 2005, 07:11
Hayden Hayden is offline
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Re: NP231 converting to NP242

Why would i do a hub conversion? The 242 still has a 2wd option and all the same range selections as the 231 but it also has the option for full time 4wd on the street, good for snow and icy conditions and wet weather. I am tradeing my 231 for the 242.


Hayden
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  #4  
Old September 7th, 2005, 07:19
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JLane99XJ JLane99XJ is offline
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Re: NP231 converting to NP242

oh i see, my mistake i thought u were talking about the model that came in the grands that was all-time 4wd
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  #5  
Old September 7th, 2005, 07:58
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xj-grin xj-grin is offline
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Re: NP231 converting to NP242

Quote:
Originally Posted by Hayden
I have a 98 XJ that I am wanting to take original NP231 out of and swap in the NP 242 so that I can have the full time option. I know for the most part it is a direct bolt in. My question is for anyone who has done it, what does it take the change the wireing so the "full time" light will come on? I am trying to make this look as factory as possiable. I know there is a location for the full time light but im not sure if there is actually a bulb in it or not. I would also assume the switch on the T-case uses a different plug for the indicator wires. If anyone has any insight on this I would appericiate any help.


Thanks
Hayden
Hayden,

I contemplated and actually started this swap in my 99, but decided that my 5 speed and stroker would provide a bit too much torque to the 242 for comfort, so I abandoned it. I did at one point have a 242 installed however, so I have a little insight. Make sure the case you pick up has a 23 spline input gear, as that is what your 98 tranny has. I picked up a case for really cheap out of a 90, but then had to swap in a 23 spline gear. While the older cases use a mechanical speedo gear, you can swap your existing 231 gear assembly into the 242 case and make the speedo work, no problem (at least with mine). You will want to pick up a shift gate for your shifter to match the different shift pattern on the 242, as well as a new bezel, but you don't actually need it. As to the full time light, I never got that far, but in asking around I was told that the 99 wiring would light the light, it simply needs a bulb, so I would guess that is all you would need to add too.

If you're interested, I have the t-case I was going to swap for sale, as well as a shift gate I would trade you for yours... PM me if you're interested.

Chris
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  #6  
Old September 7th, 2005, 09:04
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XgeekstarX XgeekstarX is offline
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Re: NP231 converting to NP242

Quote:
Originally Posted by xj-grin
Hayden,

I contemplated and actually started this swap in my 99, but decided that my 5 speed and stroker would provide a bit too much torque to the 242 for comfort, so I abandoned it.

Chris
last time i checked it was good for 1486ft/lbs.




from 4wheeloffroad.com:

NP242

Type: Part-time/ full-time, aluminum, chaindriven case

Low range: 2.72:1

Applications: ’98-present Dodge Durangos and Dakotas, Hummers, and ’87-present Jeep Cherokees

If you have an NP242 in you truck, keep it! Stop sending us letters asking how you can swap in an NP231 because we don’t want you doing it. The NP242 is a better case and it gives you more choices when it comes to routing power to the wheels. The NP242 HD is stronger than the NP231, and you can get slip-yoke eliminator kits and lower low-range gears for it just like an NP231. If it makes you feel better, take pride in knowing that AM General uses its own version of this case called the “NVG242 HD AMG.” It is rated for the 11,500-pound GVW of the Hummer. Of course it is way cooler than the version in your Cherokee because it has an external transfer case oil cooler. We’ll let you know when we come up with a way to retrofit it to other cases.

Last edited by XgeekstarX; September 7th, 2005 at 09:08.
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  #7  
Old September 7th, 2005, 09:12
XJJack XJJack is offline
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Re: NP231 converting to NP242

I have the 242 in my 98, and I hope it is just adding the bulb because mine dosn't work ether.
Those ratings sound great, but how do I keep from having to change the chain every two years from strech?
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  #8  
Old September 7th, 2005, 09:28
88XJ_FireFighter 88XJ_FireFighter is offline
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Re: NP231 converting to NP242

I have the 242 in my 88 as well. I was just about ready to swap in a 231 till I found a 242 from another 88. Do the chains on the 242 suck that bad?? Aren't they like $100/pc?? I certainly don't want to have to buy the case for $150 and spend another $100 for a chain.

Sorry for the hijack.
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  #9  
Old September 7th, 2005, 09:34
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CartsXJ CartsXJ is offline
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Re: NP231 converting to NP242

Quote:
Originally Posted by 88XJ_FireFighter
I have the 242 in my 88 as well. I was just about ready to swap in a 231 till I found a 242 from another 88. Do the chains on the 242 suck that bad?? Aren't they like $100/pc?? I certainly don't want to have to buy the case for $150 and spend another $100 for a chain.

Sorry for the hijack.

New Chain from the dealer for a 98 242 is $161........and thats at the mechanic's price. I have about 150K on my 242 so I have a few leaks and the mode springs and fork pads are worn, won't stay in 2WD, so order up all new parts from my Jeep mechanic buddy. All for around $220, outer seals, chain, o-rings, springs, the whole-nine. And if I can ever get my hands on a 242HD from the H1, it will definately be retro-fitted in. It even comes with a 32 splined SYE from the factory and with the 32 splined front output and extra wide chain, very beefy chain case. Plus that oil cooler, I could definately use one, its gets hot under there.
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  #10  
Old September 7th, 2005, 10:54
Hayden Hayden is offline
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Re: NP231 converting to NP242

Quote:
Originally Posted by xj-grin
Hayden,

I contemplated and actually started this swap in my 99, but decided that my 5 speed and stroker would provide a bit too much torque to the 242 for comfort, so I abandoned it. I did at one point have a 242 installed however, so I have a little insight. Make sure the case you pick up has a 23 spline input gear, as that is what your 98 tranny has. I picked up a case for really cheap out of a 90, but then had to swap in a 23 spline gear. While the older cases use a mechanical speedo gear, you can swap your existing 231 gear assembly into the 242 case and make the speedo work, no problem (at least with mine). You will want to pick up a shift gate for your shifter to match the different shift pattern on the 242, as well as a new bezel, but you don't actually need it. As to the full time light, I never got that far, but in asking around I was told that the 99 wiring would light the light, it simply needs a bulb, so I would guess that is all you would need to add too.

If you're interested, I have the t-case I was going to swap for sale, as well as a shift gate I would trade you for yours... PM me if you're interested.

Chris

Thanks. The 242 i am getting is comming out of a 98XJ also so it wont be a problem with input splines and speedo stuff. I am also going to get the shift gate and bezel from the same jeep because we are installing an atlasII in place of the 242. Now, If i remember correctly the plug on the 231 for the shift light has only 2 pins, I dont think the same harness from my jeep is going to plug into the 242 plug. There inlies the delema.


Hayden
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  #11  
Old September 7th, 2005, 11:13
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xj-grin xj-grin is offline
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Re: NP231 converting to NP242

Quote:
Originally Posted by Hayden
Thanks. The 242 i am getting is comming out of a 98XJ also so it wont be a problem with input splines and speedo stuff. I am also going to get the shift gate and bezel from the same jeep because we are installing an atlasII in place of the 242. Now, If i remember correctly the plug on the 231 for the shift light has only 2 pins, I dont think the same harness from my jeep is going to plug into the 242 plug. There inlies the delema.


Hayden
Hayden -- I know my harness worked on the 90 case I was using, but can't speak to late model. You should see if you can get the pigtail from the doner vehicle and splice in that harness...
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  #12  
Old September 7th, 2005, 19:31
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bjoehandley bjoehandley is offline
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Re: NP231 converting to NP242

I wonder if the 242HD will bolt directly up to the AW4, that would be great for strokers with forced induction and lots of traction.
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  #13  
Old October 8th, 2005, 22:09
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Cupcake Cupcake is offline
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Re: NP231 converting to NP242

this thread has been dead for awhile but i have a few questions if anyone can answer them that would be great. i have a '91 xj with the 231 and i wanted a 242 for the full time 4wd what would i have to do and how can i tell the difference between a np231 and a 242 thanks
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  #14  
Old October 8th, 2005, 22:20
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XgeekstarX XgeekstarX is offline
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Re: NP231 converting to NP242

Quote:
Originally Posted by kev0
this thread has been dead for awhile but i have a few questions if anyone can answer them that would be great. i have a '91 xj with the 231 and i wanted a 242 for the full time 4wd what would i have to do and how can i tell the difference between a np231 and a 242 thanks
there is a metal tag riveted to the back of the case that either says NP231 or NP242. or if you're at the junkyard taking a look at the shift gate for the transfer case before you crawl under there. if it's a 242 it will have these selections.

2wd
4wd part time
4wd full time
neutral
4wd low
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  #15  
Old October 8th, 2005, 23:20
Hayden Hayden is offline
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Re: NP231 converting to NP242

And since the thread is going again.......I have looked a little more at my 98 and found that the plugs are different for the sensors between the 231 and the 242. The 242 has a 3 plong plug and the 231 is a 2 prong. Does anyone know if the third wire is burried somewhere in the harness if the jeep came with a 231?


Hayden
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