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JB Conversions Slip Yoke Eliminator Kit
& Tom Wood Drive Shaft

By Cole Ford
JB Conversions/Tom Wood Slip Yoke Eliminator Kit
By doing the conversion, you gain a much longer drive shaft and a better driveline angle. You also gain a C/V joint. These two features help alleviate those nasty drive line vibes.
JB Conversions/Tom Wood Slip Yoke Eliminator Kit
Measuring for your new drive shaft must be done carefully. Here, Cole is measuring his stock shaft for comparison-sake. Once you have the conversion done, you will need to get measurements to order your new drive shaft. Tom Wood can tell you exactly how to measure properly for a perfect fit.
JB Conversions/Tom Wood Slip Yoke Eliminator Kit
This is the main cavity of the transfer case. This whole assembly would fall out on you if you tried to do this with the case still installed in the Jeep. This is much easier to do on a bench where you can see how the parts are assembled as you take them out (they only go in one way).
JB Conversions/Tom Wood Slip Yoke Eliminator Kit
It is possible that you will need a bearing press. You may need help from a shop for this but it shouldn't be a big deal.

It's Just a Drive Shaft right?
That is like calling the Mona Lisa just a painting when you are talking to Tom Wood of Tom Wood's Custom Drive Shafts. I never realized that there is so much involved in making the perfect drive shaft. If you want to know more, just visit Tom's website www.4x4Shaft.com.

Last year in Moab at the Easter Jeep Safari, Tom had a booth set up where he was making and repairing drive shafts for people. There was almost always a crowd around his booth. At first, I thought that lots of people must have needed stuff worked on. But after watching for a while, it was kind of entertaining. It was like watching an artist paint. Tom's knowledge and ability to create, in my opinion, the perfect drive shaft left no questions in my mind about where to turn. He likened the difference between a custom shaft and a pre-made shaft to the difference between an off-the-rack suit and a custom-tailored suit.

Before ordering a drive shaft, you must first install the SYE kit in order to have proper measurements. I called Tom to order my drive shaft he had me measure the distance from the rear of my transfer case to the center of the u-joint on the rear axle side. He used this measurement to perfectly fit the drive shaft to my Jeep. Since the shaft is longer than the factory shaft by several inches, we had the ability to use a C/V joint at one end of the shaft. By basically using 2 u-joints working together, the C/V joint helps even more with the shafts overall angle, and therefore its ability to reduce vibrations. The shaft also incorporated an expandable section in the middle to allow for the travel of the suspension.

When my shaft arrived two days later I was very impressed with the craftsmanship and overall quality. The polishing and clear coat also made it very pretty. So if my Jeep ever falls over I can take it out and use it to signal for help! (Ok, so that may never happen, but it does add a very nice custom look!) Editor's Note: Be sure to plan accordingly before doing the installation and keep in mind the wait for the drive shaft to be built. Tom typically turns a shaft around within a day or two and will ship overnite if you need it in a hurry. He also offers extended replacement warranties on his shafts.

Lions, Tigers and Bears OH MY!
There are many things in this world to be afraid of and installing a SYE kit should not be one of them. Many people I have talked to seem to be afraid to take their transfer cases apart to do the install. The truth of the matter is that the transfer case is one of the simplest pieces of machinery in your Jeep.

Last year I went to Arizona to meet up with Don Bernier and the Geckos for the Goodyear Extreme Rock Crawling Championships (which they won, by the way). On the way down there I blew up an NP231 transfer case in my 1987 Wrangler. The case that had 280,000 miles on it finally wore out the range shift fork. I found myself stranded at a hotel in Phoenix, AZ. With some advice from then JP Magazine Editor, Rick Pewe' I was able to find the parts at a local shop. I was able to rebuild the transfer case in the parking lot of the hotel with a socket set, a few wrenches and a flat blade screwdriver. Although it can be pretty simple stuff, if you don't feel comfortable with it, you can always take it to your local shop and have them do it.

We did our install of the JB conversions kit with the Tom Wood Drive shaft in a very tight residential garage. It is actually possible to do the install without taking the transfer case out of the Jeep, however, we have just found it easier to dive in with both feet, take the skid plate off and remove the case. You can check out the pictures to see the steps involved and check out Tom Wood's website for some great directions.

The install took us about four hours to do. The last two hours we worked with the light of an oil lamp and one candle. As luck would have it, the power in our neighborhood went out just before we were ready to re-install the case. Since it was 10:00 PM this made for a VERY dark garage. I have now added a candle to my trail tool kit. The one small candle on top of the transmission gave us enough light to finish the install.

The only part of the installation that you might not be able to do is press in the two bearings that were required for the TJ transfer case. Some cases do not need these pressed in. Just find a local mechanic that will be willing to press these in for you when you are ready to do the install. Other than that, it is so simple that you can do it in the dark!

 

So easy you can almost do it in the dark!
JB Conversions/Tom Wood Slip Yoke Eliminator Kit
We lost power during our installation and had to finish up that night.
JB Conversions/Tom Wood Slip Yoke Eliminator Kit
Using an oil lamp and candles, we finished up the project in the dark.


Read the Installation Notes --->>>

 

RESOURCES  
JB Conversions, Inc.
P.O. Box 2683
Sulphur, LA 70664-2683

Phone:
(337) 625-2379
www.jbconversions.com
Email:
sales@jbconversions.com
Tom Wood's Custom Drive Shafts
306 East 31 Street
Ogden, UT 84401

Phone:
(877) 4xShaft
www.4xshaft.com

 

Cole Ford

Cole Ford is a staff writer for ROCKCRAWLER.com and owner of our Project Cross Trainer. Cole resides in Littleton, CO.

Contact Ford at xtremjeepn@rockcrawler.com