{"product_id":"rough-country-np231-slip-yoke-eliminator-kit-for-1987-2006-jeep-tj-yj-xj-fixed-yoke-cv-driveshaft-ready","title":"Rough Country NP231 Slip Yoke Eliminator Kit for 1987-2006 Jeep TJ\/YJ\/XJ — fixed yoke, CV driveshaft ready","description":"\u003cp\u003e\u003cstrong\u003eThe Rough Country NP231 Slip Yoke Eliminator Kit (50-7907) converts the NP231 transfer case from a slip yoke to a fixed yoke, providing a stronger rear output and enabling the use of an aftermarket CV driveshaft for improved off-road durability.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eJeep owners with lifted YJ, TJ, and XJ rigs commonly encounter failures at the NP231 transfer case rear output when retaining the stock slip yoke design. The slip yoke allows axial movement of the driveshaft but places extra stress on the output shaft and yoke, especially with increased driveline angles and larger tires. This kit includes the components needed to eliminate the slip yoke and fit a fixed yoke onto the NP231 transfer case, but it requires an aftermarket CV driveshaft—Rough Country’s extended travel driveshaft is recommended to control driveline vibration and maintain proper shaft length under suspension travel.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this kit strengthen the NP231 transfer case?\u003c\/h3\u003e\n\u003cp\u003eThe kit replaces the slip-yoke arrangement with a fixed yoke setup that transfers torque through a CV-style driveshaft instead of relying on slip splines. That reduces lateral and bending loads on the transfer case rear output, lowering the chance of flange or shaft failure under off-road stress. It also eliminates excessive movement that can fatigue the slip yoke over time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConverts to a fixed yoke configuration\u003c\/li\u003e\n  \u003cli\u003eReduces axial movement and bending loads on the rear output\u003c\/li\u003e\n  \u003cli\u003eDesigned for current NP231 shaft geometry introduced in 1997\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this kit work with my Jeep and driveshaft?\u003c\/h3\u003e\n\u003cp\u003eThis kit is built specifically for NP231 transfer cases used in 1987–2006 YJ, TJ, and XJ Jeeps. It does not work with factory slip-yoke driveshafts; an aftermarket CV driveshaft is required. Early NP231 units can still use the kit if the needle bearings are removed from the stock drive sprockets.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits NP231 transfer cases only — check your case model\u003c\/li\u003e\n  \u003cli\u003eRequires aftermarket CV driveshaft; OEM driveshafts are incompatible\u003c\/li\u003e\n  \u003cli\u003eEarly NP231s (pre-1997 style) need needle bearings removed in drive sprockets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat parts and installation considerations are included?\u003c\/h3\u003e\n\u003cp\u003eThe kit includes all components necessary to modify the transfer case output from a slip yoke to a fixed yoke, but it does not include the CV driveshaft. Proper installation requires basic mechanical skill, correct tools, and verification of spline compatibility with your NP231 case. If you are unsure, professional installation is recommended to ensure correct alignment and driveline geometry.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete transfer case conversion hardware included\u003c\/li\u003e\n  \u003cli\u003eRequires Rough Country extended travel CV driveshaft or equivalent\u003c\/li\u003e\n  \u003cli\u003eProfessional installation advised for accurate alignment and torque specs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this change affect driveline vibration and on-road behavior?\u003c\/h3\u003e\n\u003cp\u003eWhen paired with the correct extended travel CV driveshaft, the fixed yoke setup helps reduce driveline vibration caused by extreme angles and excessive slip-yoke movement. Properly measured and installed driveshaft length is critical to prevent binding or vibration during suspension articulation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReduces vibration when using a matched CV driveshaft\u003c\/li\u003e\n  \u003cli\u003ePrevents rear output shaft breakage under high loads\u003c\/li\u003e\n  \u003cli\u003eRequires correct driveshaft balancing and length to avoid issues\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Rough Country NP231 Slip Yoke Eliminator Kit is for Jeep owners who have lifted their XJ, YJ, or TJ (1987–2006) and plan to run larger tires or undertake serious off-road use. It’s intended for those willing to install—or have installed—an aftermarket CV driveshaft and who want to eliminate a common weak point on NP231 transfer cases for improved durability and driveline reliability. This is not a plug-and-play upgrade for stock driveshaft setups; verify transfer case model and consider professional installation if you lack driveline experience.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this kit work with the factory driveshaft?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The kit requires an aftermarket CV driveshaft; factory slip-yoke driveshafts are incompatible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will it fit all NP231 transfer cases?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Fits NP231 units; early NP231s can use it only after removing needle bearings from stock drive sprockets.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Rough Country","offers":[{"title":"Default Title","offer_id":67585135509689,"sku":"B084ZYHPPR","price":513.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/rough-country-np231-kit-packaging-front.jpg?v=1790468618","url":"https:\/\/redleafauto.ca\/products\/rough-country-np231-slip-yoke-eliminator-kit-for-1987-2006-jeep-tj-yj-xj-fixed-yoke-cv-driveshaft-ready","provider":"Redleaf Auto","version":"1.0","type":"link"}