LOST JEEPS :: View topic - Transfer case switch

the cawl ratio should be about the same as a TJ and mine aint too bad
i got 3.73 a 3 speed auto and 30" tires i am locked and if the bumper clears it i can climb it

as far as the tera low check out quadratec thay sell thekit for the 231 for around $1200 that would include a sye so a new rear d/s will be needed and a retube on the front but that will be very low and with gears that low mud will not be fun because you will not get the wheel speed to clean the tires imo

i would think that it would be better to go with lower gears in the axels 4.10 or 4.56
i know that every one says that you cant put 4.56's in but if a dana 30 trutrac fits and that is what the gears bolt to then i cant see why it wont?
most of the guys that i wheel with dont fool with the 4:1 t-case but in sted regear for the larger tires the general rule is some thing like this
30=3.73 nothing numericaly lower
31=3.73 will work ok for auto but 4.10 for 5 speed
32=4.10 for dirt trails ,if you have a 4 speed auto or a 5 speed and run a lot of rucks then maby 4.56
33=4.10 ok for auto 4.56 for 5 speed but some folks that wheel a lot of rocks will run 4.88

the way i see it is like this at 65mph i am cranking out 2800 rpm and grining all the way to the trail with the 4 speed auto i could probably run 4.10 and still turn less rpm at 65 heck i could probably run 4.56 and 31's if i had the trany that a KJ has so that beeing said i would go 4.56 if i were you

Author:	Mutt [ Sat Jun 17, 2006 9:18 am ]
Post subject:	Transfer case switch
Have any of you switched from the NP242 to the NP231? What is the input shaft spline count? I'm considering going to the 231 so I can install a TeraLow kit and get a 4:1 ratio. Recently I computed the crawl ration of the KJ and it ain't pretty. Even if I upgraded to 4.11 gears, it's still below 40:1. Going with a TeraLow would almost double it. Any notable differences between the 231 used in other Jeeps?

Author:	Albert [ Sat Jun 17, 2006 10:36 am ]
Post subject:
There's another option to consider for a better crawl ratio - a Rubicon. Something to keep your KJ company in the driveway. Just shake your money tree real hard.

Author:	jeepkj02 [ Sat Jun 17, 2006 2:36 pm ]
Post subject:
If you can find one of those Rock-Trac t-cases that came stock on the Rubicions, they already have the 4:1, save you some time. Check ebay, your local junkyard, etc.. EDIT: They are called NV241 or NP241 Here is an ebay listing: Click here

Author:	tjkj2002 [ Sat Jun 17, 2006 3:08 pm ]
Post subject:
The rocktrac transfer from the rubican's will bolt up to a KJ's tranny,you will need both driveshaft's remade though.Last I heard it is a perfect fit for the liberty and advance adapters does sell them,but why get one when you can get a atlas II transfer(the 4-speed version)and get the super low 10:1 reduction for about the same price and the atlas is lighter and stronger.10:1 low will really improve your crawl ratio.

Author:	Mutt [ Sat Jun 17, 2006 3:42 pm ]
Post subject:
Well, I'm thinking that I can pick up a NP231 for about $500 and a TeraLow for about $900, $1400 total. Atlas IIs start at a grand more than that. Oh yeah, I'm shaking my money tree as hard as I can and I still can't afford a Rubicon.

LOST JEEPS http://www.lostjeeps.com/forum/phpBB3/

Transfer case switch http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=3&t=9592	Page 1 of 1

Author:	uvalax236 [ Sat Jun 17, 2006 4:18 pm ]
Post subject:
Mutt...you will have to send your transfer case in to TerraFlex to have the conversion done. It takes them about 3 weeks to do.

Author:	Mutt [ Sat Jun 17, 2006 4:36 pm ]
Post subject:
Rich, Of all people, I should have known you have investigated this!

Author:	Mutt [ Sat Jun 17, 2006 5:26 pm ]
Post subject:
Aha! http://www.lostjeeps.com/forum/phpBB3/vie ... light=trac So maybe I can keep the 242.

Author:	uvalax236 [ Sat Jun 17, 2006 9:00 pm ]
Post subject:
Let me know if you need help with the swap. I have a guy here in Richmond that can ship the case off for ya. There website is here: http://www.independent4x.com/ Im not sure if the phone number is correct so let me know if it is not and I will find out the correct one for ya. Im very interested in seeing how this will work. I wonder if they change it to a twin shifter as well (Would be awsome!).

Author:	jason thompson [ Sat Jun 17, 2006 10:50 pm ]
Post subject:
the cawl ratio should be about the same as a TJ and mine aint too bad i got 3.73 a 3 speed auto and 30" tires i am locked and if the bumper clears it i can climb it as far as the tera low check out quadratec thay sell thekit for the 231 for around $1200 that would include a sye so a new rear d/s will be needed and a retube on the front but that will be very low and with gears that low mud will not be fun because you will not get the wheel speed to clean the tires imo i would think that it would be better to go with lower gears in the axels 4.10 or 4.56 i know that every one says that you cant put 4.56's in but if a dana 30 trutrac fits and that is what the gears bolt to then i cant see why it wont? most of the guys that i wheel with dont fool with the 4:1 t-case but in sted regear for the larger tires the general rule is some thing like this 30=3.73 nothing numericaly lower 31=3.73 will work ok for auto but 4.10 for 5 speed 32=4.10 for dirt trails ,if you have a 4 speed auto or a 5 speed and run a lot of rucks then maby 4.56 33=4.10 ok for auto 4.56 for 5 speed but some folks that wheel a lot of rocks will run 4.88 the way i see it is like this at 65mph i am cranking out 2800 rpm and grining all the way to the trail with the 4 speed auto i could probably run 4.10 and still turn less rpm at 65 heck i could probably run 4.56 and 31's if i had the trany that a KJ has so that beeing said i would go 4.56 if i were you

Author:	Mutt [ Sat Jun 17, 2006 10:56 pm ]
Post subject:
jason thompson wrote: the cawl ratio should be about the same as a TJ and mine aint too bad i got 3.73 a 3 speed auto and 30" tires i am locked and if the bumper clears it i can climb it as far as the tera low check out quadratec thay sell thekit for the 231 for around $1200 that would include a sye so a new rear d/s will be needed and a retube on the front but that will be very low and with gears that low mud will not be fun because you will not get the wheel speed to clean the tires imo i would think that it would be better to go with lower gears in the axels 4.10 or 4.56 i know that every one says that you cant put 4.56's in but if a dana 30 trutrac fits and that is what the gears bolt to then i cant see why it wont? most of the guys that i wheel with dont fool with the 4:1 t-case but in sted regear for the larger tires the general rule is some thing like this 30=3.73 nothing numericaly lower 31=3.73 will work ok for auto but 4.10 for 5 speed 32=4.10 for dirt trails ,if you have a 4 speed auto or a 5 speed and run a lot of rucks then maby 4.56 33=4.10 ok for auto 4.56 for 5 speed but some folks that wheel a lot of rocks will run 4.88 the way i see it is like this at 65mph i am cranking out 2800 rpm and grining all the way to the trail with the 4 speed auto i could probably run 4.10 and still turn less rpm at 65 heck i could probably run 4.56 and 31's if i had the trany that a KJ has so that beeing said i would go 4.56 if i were you Your diff gear is only one aspect of the crawl ratio, the others being first gear in the transmission and low range in the transfer case. Being that the transmission first gear is only 2.84 and the transfer case low range is 2.72, it gives you a crawl ratio of 28:1. Going to the 4:1 low range T case would put the crawl ratio in the vicinity of 47:1 with 3.73 gears. So I could keep my highway mileage and still have great off road performance. Going to 4.56s would still only give me a 35:1, but going to 4.56s and a 4:1 T case would give a 51:1 crawl ratio. Anything below 40:1 is less than optimal from my research.

Author:	PitViper [ Sat Jun 17, 2006 11:23 pm ]
Post subject:
Somehow I don't think you would need to go that low in a KJ unless you where going to do a SFA with 38" tires and turn it into a real crawler. Sounds like fun figuring this all out but it seams overkill.

Author:	tjkj2002 [ Sun Jun 18, 2006 12:31 am ]
Post subject:
Sorry to say but 4.10's is the lowest you can go in the KJ's dana 30a until someone makes special ones.The pinion shaft is longer on the dana 30a so the ring gear for any dana 30 will work just the pinion will be to short .

Page 1 of 1	All times are UTC - 5 hours [ DST ]
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group http://www.phpbb.com/