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Old 10-26-2010, 01:25 PM   #1
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slip yoke

Hey there guys and gals, I am picking up an 01 wrangler sport today that has a four inch lift on it. I am new to jeeps, and I have heard something about these slip yokes, is this something that I need to look into or will it be fine. this jeep is taking place of my polaris rang er and rzr. Going to drive it daily and also as my new hunting buggy.
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Old 10-26-2010, 01:34 PM   #2
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Slip yoke eliminators and the replacement aftermarket driveshafts that go with them are really only needed once you install a lift that is taller than about 3". Their combined purpose is to eliminate the excessively steep driveshaft angle conditions created by tall suspension lifts that invariably cause severe driveshaft/drivetrain vibrations for the short wheelbase Wrangler TJ.

You won't really need to install them unless you install a suspension lift onto your '01 TJ that is taller than 3". Some amount of driveshaft/drivetrain vibration can be expected with suspension lifts 2" to 3" as well but you can cure them with far less expensive and more easily installed solutions than the SYE and aftermarket driveshaft would cost.

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Old 10-26-2010, 02:07 PM   #3
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so if the jeep already has a 4" lift I should install a slip yoke eliminator, and thanks for your help Jerry...
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Old 10-26-2010, 02:23 PM   #4
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Yes, I would install a SYE and CV (constant velocity) driveshaft on any TJ that has a 4" or taller suspension lift. Some run their 4" lifts without them but they had to do a lot of stuff I wouldn't recommend doing to avoid the cost of installing them.

Tom Wood at www.4xshaft.com/ has a nice kit with both of those that I heartily recommend. His pre and post-sales support is really unsurpassed as well, he's a good guy to talk to for sound advice on this. If you talk with him, and do ask for him if he doesn't answer the phone, please let him know I sent you as I owe him for past favors.
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Old 10-26-2010, 02:42 PM   #5
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so.. if you have a 4" kit with a new slip yoke thing and drive shaft can you go back down in lift size without re-replacing them or would you need to adjust again.
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Old 10-26-2010, 03:15 PM   #6
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The driveshaft length would have to be shortened if the suspension lift height were reduced by much.
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Old 10-26-2010, 03:33 PM   #7
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do lifts that lower the t case still require a sye, or should the t case NOT be lowered and simply add the slip yoke eliminator. Thanks for the help, as this is my first jeep.
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Old 10-26-2010, 03:45 PM   #8
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By itself, a 1" t-case drop is not enough to eliminate the vibes caused by a 4" suspension lift. You either need to increase that drop to at least 2", or install both the 1" drop plus 1" taller motor mounts. Installing a SYE kit and longer CV driveshaft is the right way to correct the angles caused by a tall suspension lift to prevent vibrations. Any other method like the 2" t-case drop or combination of 1" t-case drop plus 1" taller motor mounts is no better than a band-aid fix. Not to mention that a-case skidplate drop loses some of the ground clearance you gained by the suspension lift... partially defeating the purpose of the suspension lift.
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Old 10-26-2010, 03:50 PM   #9
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Originally Posted by Jerry Bransford View Post
install both the 1" drop plus 1" taller motor mounts.
Is that referred to as "the bubba" by any chance?

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