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Rugged Ridge Heavy Duty NP231 Slip Yoke Eliminator Kit (88-06 Jeep Wrangler YJ & TJ)

Item J12680
Market Price $287.49 You Save 13% ($37.50)
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$249.99 (kit)

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    Features, Video & Details

    • Kit Contains Transfer Case Main Shaft, Aluminum Rear Output Housing, Bearings, Seals, Snap Rings, Bolts
    • Transfer Case Main Shaft Delivers 54 Percent More Torque Than the Original
    • Transfer Case Main Shaft Minimizes Driveline Vibration and Improves Bearing and U-Joint Life
    • Compatible with 1987-2006 Jeep Wrangler Models

    Review & Installation Video

    Review & Install Video

    A slip yoke eliminator kit is designed to eliminate the slip yoke on the back of the transfer case, giving you a shorter transfer case, and therefore a longer driveshaft. However, this is not something that you can just install on its own. You are going to need that longer driveshaft and it's also going to have to be a CV or constant velocity driveshaft, which will also most likely be a double-cardan driveshaft. You're also going to need an adjustable set of control arms in the back, at least a set of adjustable upper or lower control arms, so that you can roll the pinion angle of that rear axle. So there are a couple of other pieces that go along with this kit, not just the slip yoke eliminator kit. I'm going to talk you through the installation of this kit, which I am going to give a two out of three wrenches. There is no cutting or major modification necessary to get this installed. But you are disassembling your transfer case. Now, transfer cases can seem like a magic black box. If you haven't opened one up before, I promise you, they're simpler than you think they are. So if you're somebody who's handy and you want to attack this in your driveway, you absolutely can. However, if you're not comfortable with that, taking this to a shop is not going to be an issue either.Now, the install is probably going to take you around three hours by the time you get everything apart, back together, and refilled. But we'll talk more about that in a second. So Rugged Ridge has this heavy-duty slip yoke eliminator kit, and then they also have their mega short slip yoke eliminator kit. The mega short is going to give you a little bit of additional driveshaft length, so you can get a little bit of a flatter driveshaft angle if you have a larger lift or you're going with a tummy tuck. Also, those mega shorts will require an electronic speedometer sensor, so that's going to change things up a little bit as well. Now, there are going to be some other slip yoke eliminator kits on the market. Most other companies will also make a standard short and a mega short version, and they are going to be right around the same price. Some are a couple dollars more. Some are a couple dollars less. But they are all going to work for you in shortening up the transfer case. As far as the construction of this kit, you are going to get everything that you need to make things work. You have your slip yoke eliminator itself, which is basically going to be the part that goes around the rear output shaft of your transfer case. You are going to have a new shorter output shaft. This does come with a yoke, which will get you set up for that CV driveshaft. Because this is the standard short, heavy-duty version, you will have a speedometer ring as well. Now, this ring is not going to affect your speedometer as far as calibration. That's the side that actually goes on the sensor. But this is going to allow you to use a factory-style sensor. Like I said before, I am going to give this a two out of three wrenches for the install. However, if you do a little bit of research, you watch a couple videos, do some reading, this is definitely something that you can tackle in your driveway if you choose to. Again, if it is a little bit too much for you, there's no shame in taking your Jeep to a shop to have this done. Again, you can expect to put about three hours into the install, start to finish, because there are going to be a couple of different steps. Now, the first thing to note is that you can do this in your Jeep. I've done it a couple of times, and I've always done it in my Jeep. If you do choose to unbolt the transfer case from the transmission, you can go that route and do it on a bench as well, if you don't feel like laying under the Jeep for that long. Now, the first step in this installation is, of course, removing your rear driveshaft. Then, you're going to go ahead and disassemble the transfer case by removing the rear half of the case. You're going to remove the factory output shaft, as well as the change rod mechanism for the front output shaft. You're going to have to transfer over your gears onto your new output shaft, as well as your speedometer sensor. Something else to consider while you have your transfer case apart, while you're installing this kit, is to go with a wider gear set and a wider chain if you need some additional strength, because you're running really big tires or you just find that you're stretching out a factory-sized transfer case chain. Go ahead and reinstall that with your chain. Use some gasket-making material to reseal your new rear half of your transfer case, and go ahead and fill everything back up with fluid. Then, install your new driveshaft, as well as your new control arms to get all of your angles set up. Now, when you are taking everything apart, this is a good time to do a couple of other things inside the transfer case. If you've been maintaining your case well, all you might need to do is change out the filter for your transfer case fluid. If you have neglected your transfer case a little bit, now is a good time to go and make sure that the bearings are in good shape, and get a transfer case rebuild kit if necessary. You're also going to need to make sure that you have some new fluid for your transfer case handy when you are putting everything back together. This heavy-duty kit is right around $230, whereas the mega short is closer to $400 and has some additional aluminum components. As I said before, there are some other brands of these out there on the market. Most of them are going to be very similar in design and also in function. This is going to have a heavier-duty output shaft than your factory one, and it is going to give you a good bit of strength. Some of the ones that are going to be even more expensive out there might be some of the higher-quality components, giving you just that little bit of additional edge. So if you have around four inches of lift on your Jeep and/or you have some rear driveline vibrations, if you're looking to shorten up the transfer case, get a longer driveshaft, and set your pinion angles properly, this is going to be an affordable option that can be installed in your driveway if you choose to. So that's my review of the Rugged Ridge heavy-duty NP231 slip note eliminator kit, fitting all 1988 to 2006 Wranglers that you can find right here at

    Kit Contents. The Jeep Wrangler Slip Yoke Eliminator Kit contains a short redesigned transfer case main shaft with 18 percent larger spline diameter and delivers 54 percent more torque than the original. It also contains aluminum rear output housing, bearings, seals, snap rings, bolts, and instructions for convenient installation.

    Functional Usage. The transfer case main shaft in this Rugged Ridge Heavy-Duty NP231 Slip Yoke Eliminator Kit helps decrease driveline vibration caused by taller suspension lifts. It allows for the use of a longer drive shaft that reduces drive shaft angle and improves bearing and U-joint life.

    Fitment. These Rugged Ridge jeep accessories are designed to fit 1988-2006 Wrangler Jeep models.

    Fitment: 1988 1989 1990 1991 1992 1993 1994 1995 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 Details

    MPN# 18676.60

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Rear Output Housing
    • (1) Rear Output Seal
    • (1) Main Output Shaft
    • (2) Snap Ring for Speedometer Gear
    • (1) Snap Ring for Mode Gear
    • (1) Rear Output Spline Seal
    • (1) Rear Output Bearing
    • (1) Rear Output Yoke
    • (1) Yoke Nut
    • (1) Speedometer Drive Gear
    • (1) Rear Output Bearing Snap Ring
    • (1) Front Output Spline Seal
    Installation Info
    Will it fit my Wrangler?

      Customer Photos (5) Submit Your Photo

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        Questions & Answers (9)

        5 Top Rated Questions

        Thinking about buying this Slip Yoke Eliminator Kit.... What additional Parts would you suggest purchase of? I dont want to install this and then need additional parts...

        • It would be a great idea to replace the chain inside as well as any worn parts you may find. Depending on the condition of the internals and the amount you want to spend we would recommend a new chain and master rebuild kit to make sure everything is new and ready to go.

        Helpful (2)

        I have 97 wrangler with a 4 in lift. Will I need a new rear drive shaft if I install this kit.

        • Yes, for the Rugged Ridge Heavy Duty NP231 Slip Yoke Eliminator Kit you will need to get a longer Driveshaft, and that will also depend on the size of your lift.

        Helpful (0)

        Purchased kit works great my speedometer doesn't work now though I have a 94 yj with 4.0 is there a speedometer kit for this kit

        • At this time we do not carry any speedometer drive parts for the Rugged Ridge Heavy Duty NP231 Slip Yoke Eliminator Kit.

        Helpful (0)

        I have a 2005 Jeep Wrangler Unlimited LJ with 4 inch lift running a Dana 35 rear axle. Will this kit work and what drive shaft would you recommend?

        • With the information that you provided about your Wrangler, I would suggest going with these two items instead: Rugged Ridge Mega Short Slip Yoke Eliminator Kit w/ Speed Sensor (Item #: J14556) that can be found here: And the Rugged Ridge Rear CV Driveshaft For Mega Short Slip Yoke Eliminator (Item #: J13941) which can be found here:

        Helpful (0)

        What drive shaft will i need, i have a 05 wrangler sport with a 3in teraflex lift. Will this sye also work?

        • The slip yoke eliminator kit is not dictated by lift amount. It would be your new driveshaft that matters. This is a fixed yoke conversion kit that does away with the factory slip yoke. I would recommend the Rugged Ridge CV Rear Driveshaft w/ 2 to 6 in. Lift. -

        Helpful (0)
        Post Your Question
        4 More Questions
        What driveshaft will i need installing this on an 87 Wrangler with no lift? 1 answer
        I need a driveshaft also. I have this kit which driveshaft do I need to go with this kit? 4 inch lift 1 answer
        I'm confused do I still need to get a different driveshaft with this kit? I didnt see anyone say they did but when I go to the driveshaft section all of them say its necessary. It states " a necessary piece when you’re using the slip yoke eliminator kit on new process 231." So the SYE kits are not complete then? Little confused. Thanks 1 answer
        Speed Sensor? I see this SYE kit does not come with a speed sensor. I have been told that I would need a speed sensor with an SYE? Will I need one with this kit or only the super short SYE? 1 answer

          Customer Reviews (17) Write a Review

          Overall Rating 4.6

          out of 5 stars

          • Fit 4.705883 4.7
          • Bang For Your Buck 4.705883 4.7

          • 5/5

            June 23, 2019

            Easy enough

            Seems super durable, and well constructed. Easy to do, and the instructions were easy to read and very precise. I'm an avid diyer, and this was simple. Definitely recommend if lifting a vehicle.


            Year: 1994Submodel: Wrangler

            Helpful (1)

          • 2/5

            September 22, 2018

            needed altered

            Seems durable and has positives. Am giving low review because of the time spent trouble shooting after install. Turns out the hole for the shift rod needed widened on the bottom inside. (note: not length of shift rod but diamater of the hole on tail peice). Noticed rub marks when disassembling for the 2nd time after not being able to shift. If I'd known to check that going in, would give a higher review. Better yet would be if it didnt need altered at all....


            Year: 2002Submodel: Wrangler

            Helpful (7)

          • 4/5

            August 27, 2018

            As expected

            Works great as I expected. Easy to install with a little mechanical smarts.


            Year: 1995Submodel: Wrangler

            Helpful (6)

          • 5/5

            June 15, 2018

            Great price and great product

            Best bang for the buck! Great product with very detailed installation instructions


            Year: 1987Submodel: Wrangler

            Helpful (6)

          • 5/5

            March 26, 2018

            Easy install

            Being the first SYE I installed it was easy and quick.


            Year: 1989Submodel: Wrangler

            Helpful (6)

          • 5/5

            September 10, 2017

            I did this in my driveway.

            Like the title says. It's not complicated. I watched a few videos on line and knocked it out in a couple hours. Fast, easy and effective. So far so good.


            Year: 1994Submodel: Wrangler

            Helpful (9)

          • 5/5

            June 12, 2017

            Should have done this a while ago

            It's great to get my ground clearance back. When I had the lift installed a while ago, I should have just bit the bullet and purchased this and installed it. Instead, i wasted tons of time and money working with the diff drop kit and all that was invovled with getting that to work right. One issue with fit. The 4WD lever would not work right after installation and the mechanic had to hog out the hole in the transfer case.


            Year: 2003Submodel: Wrangler

            Helpful (13)

          • 5/5

            June 27, 2016

            New slip yoke

            Very good product came with everything it was supposed have with it and install was no problem and came in really fast without ordering over night shipping. Will definitely be ordering from them again when or if I need something else. Thanks


            Year: 2006Submodel: Wrangler

            Helpful (12)

          • 5/5

            September 23, 2015

            Awesome Product

            Awesome product, easy to install and accomplished what I needed. No more drive line vibration.


            Year: 1997White House, TN, USA

            Helpful (9)

          • 5/5

            September 11, 2015

            Rugged Ridge Heavy Duty NP231 Slip Yoke Eliminator Kit (88-06 Wrangler YJ & TJ)

            I found the product to be very easy to install. The instructions explained everything from start to finish. It is worth every penny. I would recommend and use this product for future builds.


            Year: 1998Virginia, USA

            Helpful (10)

          • 5/5

            June 15, 2015

            Great product

            Strong product and great performance. Recommend to anyone.


            Year: 2004Charleston, SC, USA

            Helpful (8)

          • 4/5

            March 13, 2015

            Excellent value for the price.

            The SYE kit was very complete and included all of the seals and clips required to complete the job. In the kit I received there was a very minor machining error on the tail housing which caused interference with the shift rail restricting it's movement. After identifying the area of interference, a couple of soft passes with a die grinder was all that was needed to provide ample clearance. Over a thousand miles later and it's working like a charm.


            Year: 1995Casper, WY

            Helpful (12)

          • 5/5

            January 20, 2015

            life saver

            Great investment- easy install, a must have for jeep owners


            Year: 1989

            Helpful (8)

          • 5/5

            January 16, 2015

            Easy Install

            The install of the Rugged Ridge Slip Yolk Eliminator was easy even for a novice like me! The slip Yolk Eliminator is working wonderfully with my 4" lift and new drive shaft.


            Year: 2004Conroe, TX, USA

            Helpful (9)

          • 5/5

            March 06, 2014

            np231 SYE awesome

            This product shipped very quick, great price. everything you need for a lifted Jeep. very easy to assemble. If needed, I'll buy another one


            Year: 1989Paducah,

            Helpful (9)

          • 4/5

            January 22, 2013

            missing parts overnighted

            I ordered the Rugged Ridge kit because I had installed one before. When it arrived, I only got the main shaft, tail housing, and yoke. I called Extreme Terrain and explained that all the small parts (snap rings, speedo gear, and yoke nut) were missing. They contacted OMIX-ADA, who I guess is the supplier for Rugged Ridge, and I had the parts in hand the next day. There's other more expensive SYE kits out there, but this one works - Once you have all the parts!


            Year: 1998Malvern, PA 19355, USA

            Helpful (9)

          • 5/5

            January 18, 2013

            Good product

            Was easy to install I just watched video on you tube and installed it. Been driving with it for 4 months no problems.


            Year: 1995OKC Oklahoma

            Helpful (9)