Description:
This short shaft kit, or slip yoke eliminator, with the new, heavy duty shaft is engineered to withstand the increased torque (50% increase) generated by extreme reduction of the Tera Low231. The kit also eliminates the need to lower the transfer case in most cases by increasing the rear driveshaft length by four inches. It includes a larger output bearing and rear housing.
Installation Notes
Install Time: 4-6 Hours
Fits 231-J transfer cases only
Earlier 231 applications with mechanical speedometer cable require updating to an electronic speedometer.
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Fits these Vehicles
* 84-01 Jeep Cherokee (XJ)
Parts Included
* Output Shaft
* Output Housing
* Yoke and Nut
* Installation Hardware
Product Details
SLIP YOKE ELIMINATORS - 101
Most 231 transfer cases came from the factory with a slip-yoke rear output (see bottom photo). This slip yoke will slide or slip in and out of the rear of the transfer case as the suspension cycles up & down. When driveshaft angles are changed due to suspension height or suspension travel the slip yoke is forced to operate at an angle and can cause binding, and in some situations will crack the case.
Another problem with the slip yoke design is that the rear driveshaft yoke cannot be removed from the vehicle without loss of transfer case fluid. Broken u-joints can often require the vehicle to be driven back off the trail with the front driveshaft only. Without eliminating the slip yoke on the rear output, this would be impossible without losing the transfer case fluid, and causing transfer case damage.
On any short wheel base vehicle (such as the Wrangler), driveshaft angle is very critical and must be addressed when making any suspension modifications. Standard factory Wrangler driveshafts are about 12”. This short driveshaft will cause severe vibration and premature u-joint failure if not upgraded.
A Short Shaft kit, or Slip Yoke Eliminator solves the short driveshaft length, allows driveshaft removal in the event of a u-joint failure without loss of fluid, and increases the output shaft strength dramatically allowing for increased power and torque to be transferred to the wheels for traction.
There are several approaches to Slip Yoke Eliminator kits. Some use a ‘hack & tap’ method which results in a lower priced kit, but does not effectively increase any strength, and can actually increase driveshaft vibration. TeraFlex was one of the innovators that developed a completely new heavy duty output shaft that can increase torque loads by nearly 50%, as well as offer solutions to the original slip yoke problems. TeraFlex has perfected low range gearing and continues to lead the industry in quality performance transfer case products.
Changing your ring and pinion ratio and/or tire size will cause an inaccurate reading of your speedometer. Replacement of the speedometer gear is a simple procedure that takes minutes to complete. The chart below lists ring and pinion ratios and tire size. Simply select the proper configuration of your vehicle from the chart.
An accurate speedometer reading is important both on and off road when detailing travel routes and for on highway safety.
Factory speedometer variances are ±3% from actual speed. Recommended speedometer driven gears are based on a manufacturer’s published tire specs for revolutions per mile. This may differ from manufacturer to manufacturer.
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