This manual covers the Trooper/Jackaroo, specifically the second generation UBS chassis, produced for the model years 1998 through 2005. Renowned for its off-road capability and durability, this vehicle offered a range of powerful engines, including the 6VD1 and 6VE1 V6 gasoline engines and the 4JX1 and 4JG2 turbocharged diesel engines. Transmission options included the 5-speed manual AR-5 and the 4-speed automatic 4L30-E. With a focus on robust engineering, the Trooper/Jackaroo has a strong legacy in off-road performance, making it a popular choice for adventure and utility. This comprehensive Service and Repair Manual, exceeding 11,000 pages, provides detailed workshop-level guidance for all aspects of the Trooper/Jackaroo. It covers routine maintenance, lubrication schedules, fluid changes, and filter replacements, alongside in-depth procedures for engine mechanicals, cooling, fuel, exhaust, and driveability systems. The manual also details transmission servicing for both manual and automatic variants, along with chassis systems including suspension, brakes, and driveline. Electrical systems, bodywork, interior components, and safety systems like the Supplemental Restraint System (SRS) are thoroughly explained with diagnostic charts, troubleshooting guides, and repair instructions, making it an invaluable resource for DIY enthusiasts and professional mechanics alike.