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The Extreme short shaft kit, or slip yoke eliminator kit, not only improves on strength, but also increases driveshaft lengths by up to 7" over stock applications.
The Extreme SS kit comes with all necessary components to modify the stock 231 case. Speedometer readings are transfered through a tone ring and electronic sensor. To adjust the calibration on Rubicon Model Wranglers you will need to have your on board computer recalibrated by a dealer or service center. On other model Wranglers a converter box is necessary to make any calibration adjustments.
Note: Earlier 231 applications with a mechanical speedometer cable require updating to an electronic speedometer.

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