NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > Modified Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

Reply
 
Thread Tools Display Modes
  #1  
Old September 10th, 2009, 18:51
Seiler's Avatar
Seiler Seiler is offline
NAXJA Member
 
Join Date: Oct 2005
Location: Aurora, Colorado
Posts: 800
241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Part 1

Well, push came to shove and I decided it was time to ditch the 242,
and upgrade to a different T-case. I wasnít interested in hacking up
my tunnel, or dropping more than $3000. With the help of DJ, I chose
the NVG241OR Rock-Trac from JB Conversions. After a lengthy E-mail
conversation (determining whether the case would have enough spline
engagement between the trans output and the T-case input,) I had one
brand new 241 with 1310 Yokes installed Front and Rear on its way via
Fed-ex freight to me for a little over $2100. By the way, the folks
over at JB are awesome. Customer service is great, and I couldnít
have asked for better service.

Few Pictures right out of the box:






oOoOohh Shiny

Anyway, I wanted to make sure I did this right. I didnít want to get
it up there, change my mind, and drop the case again. Ideally, lift
it once and keep it up there for a while. This T-case weighs right
around 100 lbs. Itís not easy when you donít have the appropriate
jack to hold it in place. My rig will be Daily Driven until I can
afford another mode of transportation. This means I want the Speedo
to work, and I want the 4 Wheel Drive Indicator Illumination to
function properly as well. JB sells a wire/switch set to make the 4WD
Indicator to work. These pieces are customized for the 241OR
application.

For reference Ė There are 3 wires (on NP242 models, 2 on NP231) coming
from the harness, to the connector.

Black/White Ė Full-Time signal
Black/Red Ė Part Time signal
Black Ė Ground Distribution




Word on the street is the 241OR has a bit of a sweet tooth, so I
picked up some liquid candy for it.



Now. A case thatís designed to handle to power output from a Cummins
Diesel Motor; Maximum Torque Capacity: 5,555 ft lbs vs. 1,885 ft lbs
with the NV231, and 1,486 ft lbs with the NV242(; 4:1 crawl ratio;
32 spline output shafts; and a direct bolt upÖ Could it get any
better? How about 4:1 2 Wheel Drive?




Yep. Teraflex now makes a 2-Low kit, for the TJ 241OR. That install
will be covered in the next reply.

Scott

Note: Above numbers regarding Maximum Torque Capacity were referenced
from Eric Zappe's (EricsXJ on ) book - "High-Performance Jeep
CHEROKEE XJ Builder's Guide 1984-2001."

JB is an NVG aftermarket distributer, and buy these cases straight
from the plant. The metal tags are not installed at the point at which
they are purchased.

All of these images are in a special "Archive" folder on my
photobucket. They should always be present in this Thread.
__________________
Previous Member Name - xj≤

Last edited by Kittrell; September 14th, 2009 at 19:58.
Reply With Quote
  #2  
Old September 10th, 2009, 22:59
Phil's Avatar
Phil Phil is offline
Stock Mod What?
 
Join Date: Feb 2003
Location: West Sacramento, CA
Posts: 3,439
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Time for an Atlas.
__________________
Spotters lead the way!
My green junk.
1989 XJ Wagoneer. Completely stock.
G & G Offroad and Auto Repair can make you think you can run the Box!
Reply With Quote
  #3  
Old September 11th, 2009, 06:33
BlueGerbil's Avatar
BlueGerbil BlueGerbil is offline
NAXJA Forum User
 
Join Date: Nov 2002
Location: Germany
Posts: 526
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Iīm watching this - my 241 from a JK is sitting in the garage, hope to get it under the rig this winter.
Reply With Quote
  #4  
Old September 11th, 2009, 09:00
stumpXJ stumpXJ is offline
NAXJA Forum User
 
Join Date: Apr 2008
Location: Atlanta, Georgia
Posts: 2,820
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

I put one in my XJ a few months ago, they are nice units. I got mine rebuilt from Mantrans in Tallahassee. $850.00 bucks, and I picked it up. I dont understand how they can charge such a premium at JB? I got my yokes from Tom Woods for $180 bucks.

Your T-case looks reconditioned to me, not "new" from Jeep. It looks like the case was bead blasted (from the color, and the missing or bead blasted badge that's normally red), and probably rebuilt or at least gone through to make sure everything is up to par. Did they say it was "new"? I could be totally wrong, just curious.

The 2 wheel low kit is pretty cool, what was the cost on that?

One of the best/easiest (and cheapest if you look around) ways to get a string case, and 4:1! Bolts right in, although you will probably have to trim the transmission mount a little.

~James

Last edited by stumpXJ; September 11th, 2009 at 09:04.
Reply With Quote
  #5  
Old September 11th, 2009, 09:07
Seiler's Avatar
Seiler Seiler is offline
NAXJA Member
 
Join Date: Oct 2005
Location: Aurora, Colorado
Posts: 800
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Quote:
Originally Posted by stumpXJ View Post
I put one in my XJ a few months ago, they are nice units. I got mine rebuilt from Mantrans in Tallahassee. $850.00 bucks, and I picked it up. I dont understand how they can charge such a premium at JB? I got my yokes from Tom Woods for $180 bucks.

Your T-case looks reconditioned to me, not "new" from Jeep. It looks like the case was bead blasted (from the color, and the missing or bead blasted badge that's normally red), and probably rebuilt or at least gone through to make sure everything is up to par. Did they say it was "new"?

The 2 wheel low kit is pretty cool, what was the cost on that?

One of the best/easiest (and cheapest if you look around) ways to get a string case, and 4:1! Bolts right in, although you will probably have to trim the transmission mount a little.

~James
I've got Part 2 coming here in a little bit. Should answer a few of your questions. It's hard to tell if it truly was "new" or not. It sure had a brand new look to it. The inside of the case was spotless as well. I can't answer that for sure

The yokes from JB together, were only $120. $60 a yoke.

Tera 2-low ran a little more than $250. Also, I did have to trim the transmission mount slightly to get the T-case to fit. That'll come in Part 3

Scott
__________________
Previous Member Name - xj≤
Reply With Quote
  #6  
Old September 11th, 2009, 10:16
RCP Phx RCP Phx is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Phoenix,Az
Posts: 10,562
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Quote:
Originally Posted by stumpXJ View Post
I put one in my XJ a few months ago, they are nice units. I got mine rebuilt from Mantrans in Tallahassee. $850.00 bucks, and I picked it up. I dont understand how they can charge such a premium at JB? I got my yokes from Tom Woods for $180 bucks.

Your T-case looks reconditioned to me, not "new" from Jeep. It looks like the case was bead blasted (from the color, and the missing or bead blasted badge that's normally red), and probably rebuilt or at least gone through to make sure everything is up to par. Did they say it was "new"? I could be totally wrong, just curious.

The 2 wheel low kit is pretty cool, what was the cost on that?

One of the best/easiest (and cheapest if you look around) ways to get a string case, and 4:1! Bolts right in, although you will probably have to trim the transmission mount a little.

~James
They are brand new and do not come from Jeep.They are direct from New Venture!
Heres mine from 6yrs ago,notice the nice shiny sticker.

Last edited by RCP Phx; September 11th, 2009 at 10:22.
Reply With Quote
  #7  
Old September 11th, 2009, 11:57
stumpXJ stumpXJ is offline
NAXJA Forum User
 
Join Date: Apr 2008
Location: Atlanta, Georgia
Posts: 2,820
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Quote:
Originally Posted by RCP Phx View Post
They are brand new and do not come from Jeep.They are direct from New Venture!
Heres mine from 6yrs ago,notice the nice shiny sticker.
Lol...mine has a 'shiny' sticker as well, but it was reconditioned. I guess what struck me as odd on the OP's tcase was the lack of sticker, and the red model plate if it was being billed as new. Doesnt really make any difference in the long run if it works like it should, I was just curious. especially at the huge price difference from a good used unit.

I can understand using 2 lo while pulling a heavy load up a hill, that makes sense. 2lo on the trail, I suppose that would be a good thing as well. Would be cool to try out...

~James
Reply With Quote
  #8  
Old September 11th, 2009, 12:09
256offroad 256offroad is offline
NAXJA Forum User
 
Join Date: Jan 2007
Location: Huntsville Alabama
Posts: 2,524
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Quote:
Originally Posted by stumpXJ View Post
Lol...mine has a 'shiny' sticker as well, but it was reconditioned. I guess what struck me as odd on the OP's tcase was the lack of sticker, and the red model plate if it was being billed as new. Doesnt really make any difference in the long run if it works like it should, I was just curious. especially at the huge price difference from a good used unit.

I can understand using 2 lo while pulling a heavy load up a hill, that makes sense. 2lo on the trail, I suppose that would be a good thing as well. Would be cool to try out...

~James
you have no idea how bad i want 2low.... but i am just going to live with my stock np231 for now...


cool build this has got me thinking!


WHERES THE REST?
Reply With Quote
  #9  
Old September 11th, 2009, 12:28
Seiler's Avatar
Seiler Seiler is offline
NAXJA Member
 
Join Date: Oct 2005
Location: Aurora, Colorado
Posts: 800
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Quote:
Originally Posted by stumpXJ View Post
Very cool...

This may be a dumb question, but what would you use 2 lo for? I think the kit is cool, but then I started thinking... why do I need that?

~James
I have a really steep driveway, on somedays it can be a real challenge to climb that 5" curb......

Quote:
Originally Posted by 256offroad View Post
WHERES THE REST?
Part 2 Ė This will mainly involve installation of 2-Low into the case. Part 2 has to be split into two, I had too many pictures.

Alright. First off, I canít say I was hot on the idea of cracking open my brand new T-case and yanking everything out just to replace a small piece at the bottom. However, DJ badgered me into picking this piece up. $250 and 1 week later, I had a small white box waiting for me on a brown UPS truck. I work for UPS, so I can just jump on the truck before it leaves the hub and pickup my own stuff before 8am every morning.

Unfortunately, the only copy of installation instructions I could find were in reference to the JK Wrangler Rubicon. From what I was able to dig up, there are a few differences between the TJ Rubicon 241ís, and the JK Rubicon 241ís.

-Different bolt patterns holding the two case halves together
-The output / input shafts differ
-Speedometer housing / tailcone. TJ 241 has an electronic Speedometer in the tailcone, whereas the JK 241 has something else

Iím not exactly sure what the JK 241 uses to report speed to the computer, mostly because I donít have access to one. BlueGerbil Ė If you could chime in on this, maybe snap a picture or two, I would greatly appreciate it.

Moving on, Iíll attempt to document the procedure I followed, for future reference to anyone planning this modification. Iím going to assume the T-case is already removed from the vehicle, and comfortably resting on a work bench / garage floor.

-Mark front and rear yoke orientation, in relation to the output shafts.
-Remove front and rear yokes (or, if you have a T-case with a flange, remove flange).




-Remove shift lever, detent plug (Assembled in 3 pieces Ė plug, spring and plunger), and Transfer Case Position Sensor.






-Remove the support for the Shift lever. This houses the seal, and bearing for the Shift Sector.



-Mark orientation, remove tailcone / speedometer housing.

OK, this is where you have to be careful. Inside the speedo housing, there is a tone ring. This is what sends the pulsing signal, to make everything work. In order for it to catch on the output shaft, it sits on a retaining pin. This retaining pin also sits in a small hole on the output shaft. When you remove the tone ring, make sure you handle that retaining pin carefully. Otherwise, itíll fall out and you might never see it again.




I, like an idiot, forgot to take a picture of the tone ring and the inside of the speedo housing. It looks very similar to what's displayed in the image below (inbetween the mainshaft, and ESS speedo housing.



-Remove the 18 bolts holding the two case halves together, and pry apart.
-Donít mess with the oil pump on the rear half. Thereís a bolt holding it in place. You shouldnít need to mess with it anyway. Loosening the bolts will ruin your day. Everything is aligned together.



ContinuedÖ
__________________
Previous Member Name - xj≤
Reply With Quote
  #10  
Old September 11th, 2009, 09:24
stumpXJ stumpXJ is offline
NAXJA Forum User
 
Join Date: Apr 2008
Location: Atlanta, Georgia
Posts: 2,820
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Very cool...

This may be a dumb question, but what would you use 2 lo for? I think the kit is cool, but then I started thinking... why do I need that?

~James
Reply With Quote
  #11  
Old September 11th, 2009, 09:37
JeepFreak21's Avatar
JeepFreak21 JeepFreak21 is offline
NAXJA Forum User
 
Join Date: Jun 2002
Location: Cameron Park, CA
Posts: 7,823
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Quote:
Originally Posted by stumpXJ View Post
Very cool...

This may be a dumb question, but what would you use 2 lo for? I think the kit is cool, but then I started thinking... why do I need that?

~James
Front digs, tight turns, drag racing in the mall parking lot
Billy
Reply With Quote
  #12  
Old September 11th, 2009, 10:26
Jes's Avatar
Jes Jes is offline
www.urfracing.com
 
Join Date: May 2002
Location: San Bruno, CA.
Posts: 6,369
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Quote:
Originally Posted by JeepFreak21 View Post
Front digs, tight turns, drag racing in the mall parking lot
Billy
You can't do front digs if ya have a bike chain in your transfer case.
Reply With Quote
  #13  
Old September 11th, 2009, 10:07
badron badron is offline
NAXJA Forum User
 
Join Date: Apr 2005
Location: Ohio
Posts: 1,177
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Quote:
Originally Posted by stumpXJ View Post
Very cool...

This may be a dumb question, but what would you use 2 lo for? I think the kit is cool, but then I started thinking... why do I need that?

~James
Just the thing for saving the clutch when dragging that 7200 pound trailer up a bad hill on pot hole road.
LOTS of torque at low road and engine speeds.
By minimizing clutch slipping trying to keep torque up but road speed down it (2low) will pay for itself by just saving one clutch, pressure plate replacement.
With a heavy trailer, big tires and almost any gearing useful for the highway. 2 low is the best thing since trailer brakes.
Reply With Quote
  #14  
Old September 11th, 2009, 10:31
jeepme's Avatar
jeepme jeepme is offline
NAXJA Forum User
 
Join Date: Jun 2003
Location: Dublin California
Posts: 1,345
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

2low is great when you have a non selectable locker up front. It takes all the stress off the front end when turning in a tight spot and you would be amazed at how much you can do in 2wheel low on a trail. It really reduces the stress on steering and your front end. I use mine all the time with my aussie up front, well worth the money!!!!
Reply With Quote
  #15  
Old September 11th, 2009, 20:14
RCP Phx RCP Phx is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Phoenix,Az
Posts: 10,562
Re: 241OR Rock-Trac/Teraflex 2-Low/Novak Cable Shifter Install

Great write up,let us know how it comes out!Also curious if this could work for the early cases?
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Novak shifter and the 2-low kit xjtrailrider Modified Tech Discussion 4 March 31st, 2009 20:12
Novak T.C. shifter SUA SPONTE Modified Tech Discussion 14 January 23rd, 2008 20:15
Novak SHifter Q's Kejtar Modified Tech Discussion 20 May 8th, 2006 22:40
Novak shifter for the 231? Kejtar Modified Tech Discussion 9 March 5th, 2005 05:44


All times are GMT -7. The time now is 11:41.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014