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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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      Review & Installation 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

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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


      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 -


      Customer Reviews (18)

      Write a Review

      Ratings Summary

      4.6 out of 5 overall rating from 18 customers

      • November 20, 2019

        4 1998 Wrangler - Ptaldrich

        Pretty simple

        Install was pretty simple. Atleast once I figured out how to get everything lined up and in place the right way. The SYE is as advertised and directions are pretty straightforward.

        Helpful (0)
      • June 23, 2019

        5 1994 Wrangler - Mars

        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.

        Helpful (1)
      • September 22, 2018

        2 2002 Wrangler - Montana

        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....

        Helpful (7)
      • August 27, 2018

        4 1995 Wrangler - LeeD

        As expected

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

        Helpful (6)
      • June 15, 2018

        5 1987 Wrangler - Shannon

        Great price and great product

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

        Helpful (6)
      • March 26, 2018

        5 1989 Wrangler - Robert

        Easy install

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

        Helpful (6)
      • September 10, 2017

        5 1994 Wrangler - GregP

        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.

        Helpful (9)
      • June 12, 2017

        5 2003 Wrangler - dwcfastrice

        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.

        Helpful (13)
      • June 27, 2016

        5 2006 Wrangler - Ratman

        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

        Helpful (12)
      • September 23, 2015

        5 1997 - Kirby

        Awesome Product

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

        Helpful (9)

      Questions & Answers (9 answers)

      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

      Installation & What's in the Box

      Installation Info

      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

      Will It Fit My Wrangler

      • TJ Wrangler 2 Door - 97, 98, 99, 00, 01, 02, 03, 04, 05, 06
      • TJ Wrangler Unlimited 2 Door - 04, 05, 06
      • YJ Wrangler 2 Door - 88, 89, 90, 91, 92, 93, 94, 95