231 crawl box

monkeyevil · Nov 8, 2006

I haven't heard anything bad about them yet.
I ASSumed that the 2wd aw4's are 21 spline and the 4wd ones are all 23 spline. I have been wrong before though

I would run a 231, just because I like the selectability more. Plus who knows if the 242 can handle twice the torque.

jeepnuts311 · Nov 8, 2006

hey,

i had 2 pre-91 transfercases both from behind AW4s and they were both 21 spline SHORT inputs on the transfercase. it upgraded to 23 spline with the addition of the H.O. engine. (you can see the difference at www.novak-adapt.com)

also, the 242 can handle just as much torque as the 231. the model number of the transfer cases breaks down by number.

-the first number means how many speeds: 2 =HI and LO
-the second is a rating from a torque chart: 3,4 (4 is more)
-the third is a number assigned to the way the outputs are coupled:1= no differentiation, 2= true diff, 8/9= viscous coupling and so on.
(info can be found from the new process/ new venture website)

considering the np231 and the np242 that were behind renix motors and AW4 have the same splinage and same bolt pattern i dont see why you cant use the box 4 rox and the np242 together, that being said it is simple as pie to swap to a np231 from a np242. i did it in 6 hours and that included rebuilding the np231 and SYEing it first.
its much easier to rebuild a 231 than a 242, but neither one are hard if you pay attention IMO

hth
-Tim

goodburbon · Nov 8, 2006

I'm callin bullshit on this one

by that reasoning the np205 is waaaaaaay weaker than the 231 and 242, and that is just plain untrue. What's the 5? a selectable locker?

dallas xjs · Nov 8, 2006

i am wishing now i had a np999 stak

vetteboy · Nov 8, 2006

goodburbon said:
I'm callin bullshit on this one

by that reasoning the np205 is waaaaaaay weaker than the 231 and 242, and that is just plain untrue. What's the 5? a selectable locker?

Hmm...where does this place the NP207, 208, 203, etc?

vetteboy · Nov 8, 2006

FWIW I have that NP231 crawl box setup. The kit comes like this:

If you want to look at the assembly and stuff, here's 18 pics of it going together:
http://www.phatserver.net/~chris/list.php?path=XJbuild/crawlbox/

I can't speak for the performance of it yet though. Rig's still on jackstands. The kit itself was extremely high quality, all parts fit together just as intended, and with everything connected everything spins just like it should and all speeds work. Should be a fun experiment at 183:1 crawl ratio.

KSXJ · Nov 8, 2006

so if I get this correct, this is to set up a doubler? If so you have a 231 and what togther?

CanMan · Nov 8, 2006

KSXJ said:
so if I get this correct, this is to set up a doubler? If so you have a 231 and what togther?

D300 I assume.

KSXJ · Nov 8, 2006

I tried the link in the picture and no luck. Anyone have the link to where you can buy one.

vetteboy · Nov 8, 2006

KSXJ said:
so if I get this correct, this is to set up a doubler? If so you have a 231 and what togther?

Mine's going to a D300 (non-flipped), but you can get an adapter plate & intermediate shaft for a huge variety of cases.

You cut the front output off the NP231 box and bolt the new plate over the back of it. The mode fork comes out and the range fork stays there.

DaffyXJ · Nov 8, 2006

vetteboy said:
FWIW I have that NP231 crawl box setup. Should be a fun experiment at 183:1 crawl ratio.

I run an atlas 4 speed with 5:38's. Total crawl at 155:1. It is absolutely night and day the stuff you will crawl over.

CanMan · Nov 8, 2006

KSXJ said:
Anyone have the link to where you can buy one.

http://cgi.ebay.com/ebaymotors/Creeper-box-NP-231-crawl-box-doubler-np231-jeep-TJ_W0QQitemZ150055132354QQihZ005QQcategoryZ46093QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Check over on the PBB too, I believe they guy is a vendor(?).

KSXJ · Nov 8, 2006

when I searched I found another thread with this setup and looks like you have to cut up the floor to fit. Is that correct?? or can it be done without cutting up the floor?

RCP Phx · Nov 8, 2006

XJ's have enough driveline issues,now with an even shorter shaft....
Also:http://www.newventuregear.com/tcases.html

goodburbon · Nov 8, 2006

RCP Phx said:
XJ's have enough driveline issues,now with an even shorter shaft....
Also:http://www.newventuregear.com/tcases.html

So the stock 231 can handle 400 more ft/lbs of torque than the 242.

NOS/86 · Nov 8, 2006

vetteboy said:
Mine's going to a D300 (non-flipped), but you can get an adapter plate & intermediate shaft for a huge variety of cases.

You cut the front output off the NP231 box and bolt the new plate over the back of it. The mode fork comes out and the range fork stays there.

how hard is it to do a drivers side drop ? i guess you'll have to flip the dana300 ? i'm wanting to do this setup , but have not seem anyone around my area that has tried this .

monkeyevil · Nov 8, 2006

NOS/86 said:
how hard is it to do a drivers side drop ? i guess you'll have to flip the dana300 ? i'm wanting to do this setup , but have not seem anyone around my area that has tried this .

You would need a d300 flip kit (Down east offroad) or just run a 231 behind the doubler.

tysonxj · Nov 9, 2006

NOS/86 said:
how hard is it to do a drivers side drop ? i guess you'll have to flip the dana300 ? i'm wanting to do this setup , but have not seem anyone around my area that has tried this .

Or this: http://www.pirate4x4.com/forum/showthread.php?t=503209

That would be sweet-

radardog · Nov 9, 2006

tysonxj said:
Or this: http://www.pirate4x4.com/forum/showthread.php?t=503209

That would be sweet-

HOLY "F"ING BLING!!!!!

ok, so i am trying to fiure out why people are running the 300's... is it just because of the fact that there is no chain, or is it because a 231/231 or a 231/242 is way longer than the 231/300 combo?

at first i thought that this was the most amazing deal ever, then i saw that i need to buy a 231... or in my case two 231s or a 231 and a 242.... a custom case is looking like a good deal... maybe...

jeepnuts311 · Nov 9, 2006

goodburbon said:
I'm callin bullshit on this one

by that reasoning the np205 is waaaaaaay weaker than the 231 and 242, and that is just plain untrue. What's the 5? a selectable locker?

this information is from the new process website. im not saying its gospel, but it IS the way they identify their cases. hence a 241 is an upgrade from the 231.

but i do think i was mistaken in the fact that it seems that is only true within a category, they are divided up by how they differentiate, and within that category it divided by torque using the middle number. i thought it was across the board but i was comparing apples to oranges. my bad.

and btw, the last number is how its shifted also, not just the differentiation.

http://www.newventuregear.com/tcases.html

-Tim

231 crawl box

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