The Wrangler TJ’s automatic transmission was the Chrysler 42RLE four-speed automatic, the standard auto option used with the TJ’s 4.0-liter inline-six engine and throughout the model’s production run from 1997 to 2006. Manual gearboxes (such as the AX-5 and AX-15) were also available for those who preferred them.
Overview of the automatic option
The 42RLE is a four-speed automatic transmission produced by Chrysler and shared across several late-1990s and early-2000s Jeep/Dodge platforms. In the TJ, it served as the sole automatic option, typically paired with the 4.0L engine and the common transfer case configuration, providing a balance of drivability for both on-road and off-road use.
Compatibility and specifications
In the TJ lineup, the 42RLE was the principal automatic choice and was commonly matched to the 4.0L inline-six. It is a conventional four-speed hydraulic automatic with a torque converter, designed to handle the Wrangler’s mixed duty—from highway cruising to rough trail work. This pairing helped keep maintenance familiar for dealership techs and aftermarket shops acquainted with Chrysler's late-1990s era transmissions.
Maintenance considerations for the TJ automatic
For owners, understanding the 42RLE helps with planning preventive maintenance, parts compatibility, and potential repairs as the vehicle ages. Routine transmission service—using the recommended ATF and adhering to drain-and-fill intervals—can extend life. Common aging concerns include leaks, shifting firmness, and heat-related wear, especially if the TJ has seen heavy off-road use or frequent towing.
Summary
The Jeep TJ most commonly used the Chrysler 42RLE four-speed automatic, paired with the 4.0L inline-six, as its factory automatic option. Manual transmissions were also available, giving buyers a choice depending on their driving style and off-road needs. Proper maintenance and awareness of age-related transmission issues remain key for longevity.