Crown Automotive RT24004 NP231 Slip Yoke Eliminator Kit with Drive Shaft for 87-06 Jeep Wrangler YJ and TJ
Increased Strength: This kit eliminates the weak point of the factory slip yoke design. It features a heavy-duty 32-spline main shaft that can handle significantly more torque compared to the stock unit, reducing the risk of driveline failure during demanding off-road situations.
Reduced Vibrations: The slip-yoke design can cause driveline vibrations at higher speeds. This eliminator kit replaces the slip yoke with a fixed-yoke output housing, resulting in a smoother and more balanced ride quality, both on and off-road.
Improved Driveline Angles: The kit includes a shortened output housing, optimizing driveline angles for lifted Jeep Wranglers. This reduces stress on U-joints and other driveline components, promoting longevity and maximizing performance.
This complete NP231 Slip Yoke Eliminator Kit with Drive Shaft from Crown Automotive has what you need to complete the lift on your Jeep. This kit is designed for YJ and TJ Wranglers with NP231J transfer case and 1310 driveshafts (1994-1995 YJ please check fitment). To maintain the proper driveline geometry on and off-road this kit moves the slip to the driveshaft and fixes the rear yoke in place. A much better solution to the cheaper transfer case lowering kits on the market. Perfect for 2-6" suspension lifts.
Fitment Note : 1994-1995 Wrangler YJ with 1330 U-Joints are required to switch axle yoke
- Features: Driveshaft
- Transfer Case Model: NP231
- Shipping Weight: 31lb
- Shipping Dimensions: 15in x 15in x 7in (L x W x H)
Jeep Wrangler (TJ)
- 2006 Jeep Wrangler (TJ)
- 2005 Jeep Wrangler (TJ)
- 2004 Jeep Wrangler (TJ)
- 2003 Jeep Wrangler (TJ)
- 2002 Jeep Wrangler (TJ)
- 2001 Jeep Wrangler (TJ)
- 2000 Jeep Wrangler (TJ)
- 1999 Jeep Wrangler (TJ)
- 1998 Jeep Wrangler (TJ)
- 1997 Jeep Wrangler (TJ)
Jeep Wrangler (YJ)
- 1995 Jeep Wrangler (YJ)
- 1994 Jeep Wrangler (YJ)
- 1993 Jeep Wrangler (YJ)
- 1992 Jeep Wrangler (YJ)
- 1991 Jeep Wrangler (YJ)
- 1990 Jeep Wrangler (YJ)
- 1989 Jeep Wrangler (YJ)
- 1988 Jeep Wrangler (YJ)
- 1987 Jeep Wrangler (YJ)
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Crown Automotive NP231 Slip Yoke Eliminator Kit with Drive Shaft Reviews
This kit worked great, just make sure to read the notes. My YJ is a 1994 with the 1330 u-joint, I missed the fitment note when ordering to get a new axle yoke for the 1310 u-joint, I went down the o-Riley’s and picked up conversion u-joint spicer number 5-134x. I will order the yoke sometime but for now I am on the road and the vibration from my lift kit is gone.
This is a great kit! It's very easy to install, plenty of resources on YouTube
Price
Questions
Based on the product descriptions, this kit is designed to fit:
1987-1993 Jeep Wrangler YJ with NP231 Transfer Case.
**19 and 1310 series (3.219" width) U-joints.
Regarding your specific situation:
1992 Jeep Wrangler YJ 4.0L: The RT24004 kit should fit your 1992 YJ as it falls within the 1987-1993 compatibility range for YJs with the NP231 transfer case.
2.5" Lift: This SYE kit is often recommended for Jeeps with suspension lifts (typically 2-6 inches) to correct driveline angles and reduce vibrations caused by the lift. Your 2.5" lift falls within this range.
8.8 Rear Axle: The crucial point here is the rear axle type. The Crown Automotive RT24004 kit is specifically designed for the Dana 35 rear axle. It will likely NOT be compatible with a Ford 8.8 rear axle.
Why it likely won't fit with an 8.8 rear axle:
Yoke Compatibility: The SYE kit replaces the slip yoke on the NP231 transfer case with a fixed yoke designed to work with the provided CV-style driveshaft. The other end of the driveshaft needs to mate correctly with the pinion yoke on your rear axle. A Ford 8.8 axle will have a different pinion yoke and potentially a different U-joint size/series than what is included in this kit, which is intended for a Dana 35.
In conclusion, while the Crown Automotive RT24004 SYE kit should physically fit your 1992 YJ with a 2.5" lift and NP231 transfer case, it is highly unlikely to be compatible with your Ford 8.8 rear axle due to differences in the pinion yoke and U-joint requirements.
Recommendation:
You will likely need to look for a Slip Yoke Eliminator kit and a custom driveshaft that is compatible with your NP231 transfer case and the pinion yoke on your Ford 8.8 rear axle. You may need to purchase the SYE kit and driveshaft separately, specifying the correct connections for your specific setup.
