NP231J Transfer Case Service Manual
The NP231 component service manual. Requires Adobe to view. Domain: http://www.pirate4x4.com
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Submitted by Code3TJ on 07/02/04 Edited
07/02/04
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NV4500 Install in a YJ
Here's a step-by-step guide to installing an NV4500 transmission in a YJ Domain: http://www.off-road.com
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Submitted by Code3TJ on 06/09/04
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Removing a Warn Overdrive
I get confused everytime I remove a Warn (aka Saturn) over drive from a Dana 18 transfer case that was in a Jeep or Scout 80. Looking at the exploded view from Advanced Adapters helps, but sometimes I still get it wrong and I have to figure it out all over again. I figured if I wrote up the procedure, I wouldn't forget again and at least I'd have something to look up. Domain: http://www.jeeptech.com
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Submitted by Code3TJ on 06/20/04
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Rubicon Express SYE Install
How to install a Rubicon Express SYE slip yoke eliminator kit on a NP231 transfer case. Domain: http://www.dorianjepsen.com
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by a guest on 09/12/04 Edited
09/12/04
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Saturn (Warn) Overdrive
The Saturn Overdrive (originally produced by Warn) is a bolt on 0.75:1 overdrive for Jeeps equipped with the Dana 18 transfer case. It is not a transmission exactly, but it will give you more gearing options. You can run lower gears in your differentials and still have good highway performance. Domain: http://www.jeeptech.com
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Submitted by Code3TJ on 06/20/04
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Shift patterns
Well I wasover at litegrip looking at some of their products and low and behold they have a bunch of shift patters for various items.
Dana 20, Dana 300, NP 205, Atlas/Currie, Atlas/Currie, T18 Early, T18 Late, NV 435, Jeep TJ, YJ, XJ 5 Speed, NV 4500, NV 241 OR, NV 231 Domain: http://www.litegrip.com
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Submitted by kizer on 12/01/04
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Slip Yoke Eliminator Kit
It seems that every time that Cole gets something new for Project Cross Trainer, I get conned into helping with the installation. While this is usually for my light-holding or tool-fetching abilities, his latest upgrade actually called upon my specialty; transmissions and transfer cases. After having worked in a transmission shop for 10 years, I have learned my way around gearboxes fairly well. Fortunately for the do it yourselfer, the JB kit does not require an intricate knowledge of the internals of your drivetrain, but just a basic understanding. The only special tools required to dive into this project are snap ring pliers (external), and a torque wrench. The average set of tools should be all that is needed beyond that.
The one thing that will make this project much easier is removing the transfer case from the vehicle. It can be done in the vehicle and the JB instructions will tell you this, but I discourage you from doing it this way. The chance of something falling out of place or not sealing properly greatly increase by doing it this way. Saving an hour by leaving the unit in the vehicle could be lost later in removing it to fix a leak that could have been prevented. Domain: http://www.rockcrawler.com
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Submitted by kizer on 12/28/03
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Speedo gear replacement
Any time you install larger tires and/or new gears, your speedometer and odometer will need to be recalibrated so they read correctly with your new setup. The following article will guide you through choosing the correct speedometer gear and then installing it. This information is for XJ's and TJ's, but should apply to ZJ's and YJ's as well Domain: http://www.jeepin.com
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Submitted by kizer on 10/14/03 Edited
12/28/03
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Speedo Gear Swap
Going off of local PD speed checking radar, my speeds looked pretty good after putting on the 33" tires. I was almost dead-on at 45 mph. However, this method is not the most accurate. We all know that radar doesn't work.. especially if you have ever had a speeding ticket.
On our recent off-roading trip, I checked my speed against the others in the convoy, driving trucks with factory tires, and it was suprisingly off by 10-15 mph. While the difference is hardly noticed at low speeds, highway speeds appear to be well below actual speed. I checked the speedo gear chart, seen below, and figured I needed a 32 tooth gear. It only takes one day for the Parts/Service section of your dealer to order this baby, it is $18. Domain: http://www.gotjeep.net
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Submitted by kizer on 12/18/05
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Speedometer Gear Swapout
The new 32"& tires were on and the differentials had their new 4.56 gears installed, and the speedometer was indicating 10 MPH faster than the 55 MPH the GPS receiver said I was going. Hmmm....time to get a new speedometer gear and get things back in sync. The worst part of this was that the Jeep was rolling miles up faster than it actually traveled. Kind of throws the maintenance schedule off a bit!
I picked up the gear from the parts counter at the Jeep dealership. I had ordered it earlier in the week. Don'&t ask me why they don'&t keep a better stock on hand...maybe yours will! Domain: http://www.stu-offroad.com
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Submitted by kizer on 11/02/03 Edited
12/28/03
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Spicer 18 Transfer Case Rebuild
The Spicer 18 transfer case was built for the CJ between 1945 and 1971. If you run the "18" and are in the need of a rebuild, don't hesitate. This box is a great first timer! I will try to outline some of the steps when doing a rebuild here, but in no way can this be considered a definitive source. Get a good repair manual! Domain: http://www.film.queensu.ca
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Submitted by Code3TJ on 07/19/04
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Swap a Scout Dana 300 into a Jeep
The "Texas" bolt pattern is the pattern on the input side which is the same pattern used on the Dana 20 and Dana 18. The only difference is on the Scout Dana 300, the bottom bolt is not used, only the four bolts on the side are used. Since it features this pattern, it is bolt compatible with any Jeep or Scout transmission that has a Dana 20 or Dana 18 attached to it.
The Scout Dana 300 features a 2.62:1 low range just like the Jeep Dana 300. This is a big improvement over the the 2.03:1 low range of the Dana 20. If it doesn't sound like much difference to you, remember that gears are multiplicative. If have a Jeep T-18/Dana 20/3.54s combination for example, your crawl ratio is 6.32 * 2.03 * 3.54 or 45:1. If a Scout 300 was swapped in, the crawl ratio would be 6.32 * 2.62 * 3.54 or 59:1. The same would be true if you were running a wide ratio Scout T-19. Keep in mind that all Scout T-18s, some Scout T-19s, and some Jeep T-18s were close ratio. Domain: http://www.off-road.com
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Submitted by Code3TJ on 08/02/04
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Swapping a Ford T-18 into a CJ
Swapping a Ford T-18 into your CJ may be the best alternative, because in many cases it can be swapped in cheaper and easier than any other transmission. The improvement in performance and durability of your CJ will increase exponentially with this relatively simple transmission swap. Ford T-18s are easy to find and inexpensive to buy and the Ford T-18 is compatible to a large degree with '76-'86 CJs because in most cases the originally bell housing can be retained. Domain: http://www.off-road.com
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Submitted by Code3TJ on 07/26/04
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Swapping an SM420 into a YJ
Since my Jeep is spending more time off road I wanted a transmission that could take abuse and enhance my Jeeps performance. After some research I decided on the GM SM420 transmission. This transmission was used on trucks up to 2 1/2 tons so it will stand up to anything my 4 cyl can throw at it. Domain: http://www.jeeptech.com
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Submitted by Code3TJ on 06/20/04
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