IRO Hack ’n Tap Slip Yoke Eliminator (SYE) Kit
The IRO Hack ’n Tap Slip Yoke Eliminator Kit is a budget-friendly solution for addressing driveline vibrations on lifted Jeep Cherokees and other compatible vehicles. It replaces the factory slip-yoke arrangement with a fixed transfer case yoke, allowing the use of a double-cardan (CV) driveshaft.
Unlike heavy-duty SYE kits that require replacing the transfer case output shaft, the Hack ’n Tap modifies the factory output shaft. Installation does not require opening the transfer case, making this a more economical alternative for many builds.
Important: The driveshaft option on this page is a pre-payment option. If you order a custom-length driveshaft with this kit, install the SYE first, then contact us with your required driveshaft length.
Why Install a Hack ’n Tap SYE?
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Address driveline vibrations: Helps correct driveline geometry issues encountered on lifted Jeep Cherokees and Grand Cherokees, particularly at lift heights of 4.5" or more. Results depend on the vehicle's setup and overall driveline geometry.
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Remove transfer case drop spacers: Allows you to eliminate a transfer case drop and recover valuable ground clearance beneath your Jeep.
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Simplify installation: No transfer case disassembly is required, unlike SYE kits that replace the factory output shaft.
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Use a readily available driveshaft: The kit is designed around a factory Jeep Cherokee XJ front driveshaft, which may be adapted for use in the rear when the vehicle's configuration permits. (See Fitment)
Hack ’n Tap vs. Heavy-Duty SYE
The Hack ’n Tap retains the factory 27-spline transfer case output shaft. A heavy-duty SYE replaces the factory output shaft with a stronger design, typically using a 32-spline shaft.
The Hack ’n Tap is an economical option for many street-driven and recreational off-road builds. However, because it retains the factory output shaft, it does not provide the same output-shaft upgrade as a heavy-duty SYE. Consider your engine torque, tire size, vehicle weight, and intended off-road use when choosing between the two.
Looking for the heavy-duty option? See our Heavy-Duty Slip Yoke Eliminator Kits.
Kit Includes
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1310-series double-cardan (CV) transfer case yoke
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Installation hardware
Fitment
Jeep Cherokee XJ
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1996 and newer XJ: Fits compatible NP231 transfer cases with the newer-style rear seal housing.
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1995 and older XJ: Requires the add-on seal flange when equipped with the older-style NP231 rear seal housing.
Check your transfer case before ordering. Older-style NP231 cases typically have a three-bolt rear seal housing and require the add-on seal flange. Newer-style cases do not require it. Model year is a general guide; verify the actual housing on your transfer case.
Uses a three-bolt rear seal housing. The add-on seal flange is required for this configuration.
Uses the newer-style rear seal housing. The add-on seal flange is not required for this configuration.
Jeep Grand Cherokee ZJ and WJ
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NP242 transfer case: Verify that the case has the required 27-spline output shaft. A custom-length driveshaft is required for these applications. Contact us for details. If your case has a 32-spline output, we have an alternate Hack 'n Tap for 32-Spline NP242HD cases.
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NP247/NP249 transfer case: These cases use a case-hardened output shaft, which can make drilling and tapping difficult without appropriate equipment. A custom-length driveshaft is also required. Many WJ NP247 cases are pre-drilled and tapped, we've created a hardware kit to affix the yoke to the output shaft with proper spacing on these cases, verify before purchase.
Additional Applications
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Vehicles equipped with AX-5 or AX-15 manual transmissions are compatible; a custom length driveshaft will be necessary in most applications.
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Other fitment: NP233C
Verify transfer case type, output-shaft spline count, and rear housing configuration before ordering. Compatibility should not be determined by vehicle model and year alone.
Installation Requirements and Driveshaft Selection
This kit requires cutting, drilling, and tapping the factory transfer case output shaft. Required tools include:
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3/8"-16 hand tap
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1/4" drill bit
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5/16" drill bit
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Appropriate cutting and drilling equipment
The output shaft is case-hardened. The hardened pilot section must be completely removed during cutting; otherwise, a carbide drill bit may be necessary. Proper tools and careful execution are essential for successful installation.
Which Driveshaft Should You Use?
The kit is designed to work with a factory Jeep Cherokee XJ front driveshaft. A used factory front driveshaft may be an economical option, but not every XJ front driveshaft can be used in the rear. Review the installation instructions to confirm compatibility before purchasing or installing a driveshaft.
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XJ vehicles with more than 6.5" of lift: A custom-length driveshaft may be required. Measure according to the installation instructions before ordering.
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ZJ/WJ NP242 and NP247/NP249 applications: A custom-length driveshaft is required.
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Custom driveshaft orders: Complete the SYE installation first, then contact Iron Rock Off Road with the required driveshaft length.
Iron Rock Off Road also offers an option to purchase the kit with a new custom heavy-duty driveshaft. Select the appropriate option from the product page when available.
Before You Order
Confirm your transfer case model, output-shaft spline count, rear seal housing style, and driveshaft requirements. If you are unsure which configuration you have, inspect the rear of the transfer case and review the installation instructions before ordering. Contact us with photos of your transfer case, sent to tech@ironrockoffroad.com if you need help verifying fitment.