850RE 8-Speed Transmission Conversion Kit

Unleash modern 8-speed performance in your 2012–2018 Jeep JK with the ATS 850RE 8-Speed Transmission Conversion Kit. This comprehensive system replaces your factory 5-speed NAG1 automatic with the advanced 850RE 8-speed automatic, as found in the JL Wrangler, bringing next-generation drivability and refinement to your off-road machine. Engineered for seamless integration with the 3.6L Pentastar engine, this kit offers sharper shifts, better crawl control, and full retention of factory electronics with zero tuning required in most builds. The 850RE transmission, derived from ZF's respected 8HP family, provides substantially improved shift speed, a wider gear spread (7.05:1), and enhanced low-speed control compared to the older NAG1. This translates to more aggressive first and second gear crawl ratios for off-roading and more efficient cruising gears for highway driving, reducing RPMs and improving fuel economy. The advanced clutch-to-clutch shifting, multi-plate friction systems, and computer-driven torque demand modeling ensure precise shifts and seamless power delivery, with features like multi-gear downshifting and faster tap-shift response. ATS emphasizes full OEM integration, utilizing a proprietary Translator module that connects your Jeep’s ECM, TCM, BCM, brake systems, cluster, cruise control, and traction management. Your factory NAG1 console shifter is reused, retaining its manual +/- tap-shift functionality and providing accurate shift display on your cluster (7th and 8th gears display as '1' and '2'). All core vehicle functions, including ABS, speedometer, tachometer, and remote start, remain operational as expected. This specific kit (SKU: 319-916-8380) is engineered for 2012–2018 Jeep JK and JKU models equipped with the 3.6L V6 ERB Pentastar engine and is optimized for use with the JL-style transfer case. The kit includes an ATS-inspected, dyno-tested 850RE transmission, TruLok Torque Converter, Translator module, plug-and-play wiring harness, mounting brackets, cooler lines, and hardware. It requires the use of a JL Wrangler Transfer Case (customer-supplied) and minor driveline adjustments.