NP231 & NP207 Transfer Case Parts & Upgrades for Jeep Wrangler YJ
Transfer Case & Upgrade Components for Jeep Wrangler YJ: Bearings, Oil Seals, Yokes & More.
Secure your classic Wrangler's unstoppable 4WD performance. We offer a comprehensive catalog for the NP231 and NP207 transfer cases – from full master overhaul kits to vibration-eliminating SYE upgrades complete with heavy-duty driveshafts.
- Performance Pick: RT Off-Road Slip-Yoke Eliminator (SYE) kits (available with or without heavy-duty rear driveshafts).
- Complete Rebuild: Full overhaul kits, master gasket sets including oil seals & O-rings, and hardware small parts kits by Crown.
- Internal Hardware: Drive chains, sprockets, rear main shafts, output shafts, shift forks, synchro assemblies, and case magnets.
- Bearing Tech: Precision input and output shaft bearings alongside Crown Automotive transfer case oil filters.
- Drivetrain Accessories: Spicer yokes, strap kits, slip yokes, Crown output flanges, shifter boots, knobs, and speedometer gears.
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Trail-Proven 4WD Durability: Jeep Wrangler YJ Transfer Case Solutions.
The transfer case is the very foundation of the classic leaf-sprung Jeep Wrangler YJ's off-road heritage. During the 1987-1995 production span, Jeep utilized the early NP207 unit before transitioning to the highly versatile and rugged NP231 Command-Trac assembly. However, when a YJ is modified with a suspension lift, the factory slip-yoke rear output operates at harsh angles, introducing severe driveline vibrations and accelerated seal failure. Our online inventory features the definitive performance upgrades to resolve these geometry issues permanently, alongside every component required for a professional mechanical restoration.
Trusted Trail Quality: RT Off-Road, Crown, and Spicer Excellence.
The definitive upgrade for any lifted vintage build is our RT Off-Road Slip-Yoke Eliminator (SYE) Kit, which replaces the factory slip-yoke style rear output with a rugged fixed flange. This setup pairs flawlessly with our heavy-duty RT Off-Road rear CV driveshaft to deliver completely smooth power delivery. For comprehensive internal maintenance, we stock highly detailed master rebuild kits from Crown Automotive, complete with all essential bearings, input/output seals, full gasket or O-ring configurations, and transfer case oil filters.Address internal chain slap effectively with a premium replacement transfer case drive chain and matching drive sprockets. We carry every internal mechanical piece your transfer case demands: from rugged main shafts, output shafts, shift forks, and slider inserts to synchronizer hubs, synchro rings, oil pumps, case magnets, and oil slinger rings. To finalize your assembly, our range features genuine Spicer yokes, strap kits, slip yokes, and Crown extension housing covers or output flanges. Complete your refresh with factory-style shift knobs, durable rubber boots, and a wide selection of custom speedometer gears to accurately correct your dashboard cluster after tire upgrades.