AW4 Transmission

Specifications

The Aisin-Warner AW4 transmission is a rugged and highly dependable 4-speed automatic transmission designed for the 1987–2001 Jeep Cherokee XJ equipped with the 4.0L inline-six engine. Renowned for its exceptional durability and long service life, the AW4 features a 2.80:1 first gear that delivers strong low-end torque for acceleration and off-road performance, along with a 0.75:1 overdrive gear that enables efficient and comfortable highway cruising. Its electronically controlled system uses a dedicated Transmission Control Module (TCM) to manage shift timing and torque converter lockup via solenoids, resulting in smooth, consistent, and responsive gear changes across varying driving conditions. 

Built with a robust internal design and known for handling high mileage with minimal issues, the AW4 has become a favourite among Jeep enthusiasts and builders alike, valued for its reliability, ease of maintenance, and adaptability in both daily driving and demanding off-road environments.

Transmission Variants

1987–2001 Jeep Cherokee XJ

The AW4 transmission in the Cherokee XJ was paired primarily with the 4.0L inline-six and later also the 2.5L inline-four, offering excellent reliability for both daily driving and off-road use. It features a 4-speed automatic layout with gear ratios of 2.80:1 (1st), 1.53:1 (2nd), 1.00:1 (3rd), and 0.75:1 (4th overdrive), along with a torque converter lockup system. Controlled by a Transmission Control Module (TCM), it delivers smooth, electronically managed shifts. 

1987–1992 Jeep Comanche MJ

In the Jeep Comanche MJ, the AW4 provided dependable performance for both work and recreational use. Available with the 4.0L I6 and 2.5L I4 engines, it shared the same gear ratios (2.80 / 1.53 / 1.00 / 0.75) and electronic control system as the Cherokee.  

1993–1993.5 Jeep Grand Cherokee ZJ

The early Jeep Grand Cherokee ZJ models equipped with the 4.0L inline-six used the AW4 before transitioning to other transmissions later in the model year. It retained its proven 4-speed configuration with electronic control via TCM and the same gear ratios (2.80 / 1.53 / 1.00 / 0.75). 

1989–1991 Jeep Grand Wagoneer SJ

In the later years of the Grand Wagoneer SJ, the AW4 was used alongside the 4.0L inline-six engine, replacing older transmission designs with a more modern, electronically controlled unit. It maintained the standard AW4 gear ratios (2.80 / 1.53 / 1.00 / 0.75) and featured torque converter lockup for improved efficiency. 

Frequently Asked Questions