NP231J Transfer Case Bearing and Seal Overhaul Kit

The USA Standard Gear ZTBK231J Transfer Case Bearing and Seal Overhaul Kit provides everything needed to refresh the internal components of your NP231J transfer case. This kit is specifically designed for NP231J transfer cases with a narrow input, featuring an input bearing width of 16 mm (0.63 Inch) and a rear mainshaft bearing OD of 72 mm (2.83 Inch). The kit is made in the USA and includes all essential wear items such as bearings, seals, gaskets, and snap rings. It is ideal for both full rebuilds on high-mileage units and preventative maintenance, supporting off-road usage and keeping your transfer case running strong with precision-engineered components that meet or exceed OEM standards. Installation of this kit involves complete transfer case disassembly, and professional installation is recommended to ensure accurate shim setup and proper seal fitment. The kit is compatible with 1995-2001 Jeep Cherokee models, 1995 Jeep Grand Cherokee models, and 1995-2006 Jeep Wrangler models equipped with the NP231J transfer case with a narrow input, aluminum case, and chain drive.