NP231 Remanufactured Transfer Case

The Zumbrota Drivetrain RTC231J-1 is a remanufactured NP231 transfer case specifically built for 1987-1990 Jeep Cherokee (XJ), Wrangler (YJ), and Comanche models. This unit is meticulously rebuilt to high standards, ensuring confidence and satisfaction. Zumbrota Drivetrain's expert craftsmen inspect and test all cases and internal components for wear, including cracks, stripped threads, shaft straightness, gear wear, and chain stretch. Each transfer case undergoes a rigorous cleaning process using an exclusive hydro-blast rinse and blasting procedure, followed by a proprietary shot-enticed deep cleaning that restores the OEM finish. The rebuild includes the 100% replacement of all bearings, seals, and viscous couplers. Before shipping, every unit is thoroughly spun tested to verify shiftability and noise levels. To prevent transit damage, all transfer cases are shipped in high-density plastic totes. Key technical specifications for this NP231 transfer case include a 21-spline input shaft with a 0.75-inch exposed length, a bolt-on front output yoke, and a 27-spline slip yoke style rear output shaft. It also features a 1.75-inch diameter speedometer hole, a vacuum shift indicator switch located on the speedo housing, and a two-piece tail housing. The unit is supported by a 2-Year Limited Warranty.