extreme_kj wrote:
2006 KJ wrote:
Slip Yoke Eliminator..

Is this photo from a kj?
That's not a KJ but the concept is the same. The factory rear drive shaft is a fixed length between the joints and slides in and out of the transfer case to compensate for changes in geometry. When you add a lift, the geometry changes and also strains the t-case, introducing more chance of vibration, drivability problems, etc.
The SYE replaces the output shaft on the transfer case with a (usually) slimmer housing and a fixed, usually beefier u-joint. Then the drive shaft has a telescoping section in it to compensate for the changes in length on compression. This allows the shaft to operate with less stress on the t-case, less vibration due to drive angle, less wear, etc. The only reason that you wouldn't put one on from the factory is that it's more expensive
Dan
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2005 Silver CRD Limited

245/75R16 GoodYear Duratracs
Fumoto drain | ProVent CCV Filter
Stanadyne FM100 filter | Cummins fuel pump
GDE Eco | SEGR | BoulderBars | FrankenLift | Frankenskids