Guide to Chrysler's Late Model Automatic Transmissions

JEGS Tech Specialist

Pete Mitchell

Welcome to our in-depth guide on late-model Chrysler automatic transmissions. Here, we’ll share details on every Chrysler automatic, starting with the automaker’s first four-speed, the A500 (later renamed to reflect gear count and torque capacity), part of its popular TorqueFlite series.

There’s also the Ultradrive series, the RFE, and the NAG1; each has evolved to include new technologies and designs, such as using electric control systems, ensuring smoother gear shifts, better fuel efficiency, and enhanced performance.

We’ll also touch on the reliability of these automatics and mention some of their common issues. Finally, we put together some Chrysler transmission quick chart guides for your convenience, found at the end of this guide, covering naming codes, torque factors, gear ratios, and weights.

Ready to get started? Let’s dive in.

Understanding Chrysler Automatic Transmission Options

Chrysler TorqueFlite Transmissions (1956-2007)

The TorqueFlite series debuted in 1956, boasting Simpson gear sets and torque converters for smoother shifts and more efficient power transfer.

The original line-up of three-speed automatics expanded in 1988 with the introduction of the four-speed A500. This design would become integral to various late-model vehicles from the '90s and '00s, such as the Dodge Ram, Dakota, and Durango, as well as the Jeep Grand Cherokee.

While it's a bit confusing, understanding Chrysler's transmission codes can clarify the characteristics of each unit. 

The "A" in names like A500 or A618 typically stands for "automatic." The subsequent numbers (e.g., "500" or "618") indicate the torque capacity. The terms "RH" and "RE" differentiate between hydraulic (RH) and electronic (RE) control systems, respectively. 

For example, within the A618 series, the 47RH refers to the hydraulic variant, while the 47RE denotes electronic, showing an evolution in control systems over time.

With the later 8 series, the "HP" in "8HP70", for instance, indicates "8-speed hydraulic planetary", followed by the torque capacity. 

You may find it easier to check out the quick-guide charts at the bottom of this article.

Next, let’s explore each of Chrysler's late-model TorqueFlite automatics, starting with the A500:

• A500 Series (40RH, 42RH, 40RE, 42RE, 44RE): The A500 series Chrysler transmissions include hydraulic (40RH, 42RH) and electronic (40RE, 42RE, 44RE) variants, each offering notable efficiency and durability. These helped power light-duty rear-wheel drive vehicles like the Jeep Cherokee and Wrangler, as well as the Dodge Dakota. 

• A518 Series (46RH, 46RE): Then there’s the A518, also referred to as the 46RH and 46RE transmission options, which enjoyed an electronic control system for added efficiency. Designed for more potent V8 engines, these were commonly found in larger vehicles like the Dodge Ram and the Jeep Grand Cherokee.

• A618 Series (47RH, 47RE): The A618 series, or 47RH and 47RE transmissions, was designed for heavy-duty use. Its robust construction and optional electronic control catered to high-torque demands, making it a preferred choice for Ram trucks and Dodge vans known for towing and hauling.

• A818 Series (48RE): Next up is the A818, or 48RE, which was specifically engineered to handle the torque outputs of the Cummins diesel engine. The A818 is also renowned for its heavy-duty performance, capable of enduring the demanding work environments frequented by Ram truck owners.

• 8 Series (8HP45, 845RE, 8HP70, 8HP90, 8HP95): Chrysler's 8 series spans from the 8HP45 to 8HP95, offering eight speeds with optimal power band control for efficient acceleration. These units suit a wide range of vehicles, from performance models like the Dodge Charger SRT to the Ram trucks.

Chrysler Ultradrive Transmissions (1989-2020)

The Chrysler Ultradrive transmission series marked the automaker's transition to front-wheel-drive automatics with sophisticated electronic control systems. 

Launched in 1989, the Ultradrive offered computer-controlled shifting that adapted to driver inputs for improved performance and fuel economy.

These units were matched with a variety of engines, such as the fuel-efficient 2.4L four-cylinder found in models like the Chrysler PT Cruiser and the powerful 3.6L Pentastar V6 in the Pacifica and Dodge Charger.

To help you better understand the characteristics of this Chrysler transmission series, let's explore each more closely:

• A604 Series (40TE, 41TE, 41AE): Pioneering Chrysler's foray into electronically controlled gearboxes, the A604 (40TE, 41TE, 41AE, where "T" indicates front-wheel drive and "A" means all-wheel drive) provided adaptive shift patterns to suit diverse driving conditions, enhancing the experience in vehicles like the Plymouth Voyager and Chrysler Sebring.

• A606 Series (42LE): The A606 (42LE) was an advanced adaptation of the A604, specifically designed to target performance vehicles with longitudinal engine setups. This Chrysler transmission offered refined shift strategies and improved power delivery for models like the Chrysler 300M and Dodge Intrepid.

• 42RLE: The 42RLE, a modification of the 42LE for rear-wheel drive, debuted in the 2003 Jeep Liberty. It boasted an electronic shift control with adaptive memory and an electronically modulated converter clutch (EMCC) for smoother shifts. Production of this robust, adaptive Chrysler transmission ended in early 2012.

• TES Series (40TES/41TES): Successors to the 41TE, the TES series was introduced with the 2007 Chrysler Sebring. These VLP (variable line pressure) transmissions, paired with 2.4L and 2.7L engines, feature a redesigned housing and a compact torque converter for efficient packaging and improved performance.

• 62 Series (62TE, 62TEA): The 62TE, a six-speed transverse automatic, succeeded the A604 with enhancements for larger vehicles. It's equipped with VLP technology for improved fuel efficiency and smoother shifts. Introduced in vehicles like the Chrysler Town & Country, the 62TE is designed for high-load applications like hauling passengers and cargo.

Chrysler RFE Transmissions (1999-Present)

The RFE transmission series debuted in 1999, bringing advanced "rear-wheel drive fully electronic" control to Chrysler's rear- and four-wheel drive vehicles. 

Renowned for their robust design and adaptability, the RFE transmissions have become synonymous with reliability and precision in power delivery.

The lineup, including variants such as the versatile 545RFE transmission and the heavy-duty 68RFE, was developed to meet diverse driving demands, whether towing a heavy load in a Dodge Ram 1500, hauling kids to soccer practice in a Durango, or crawling over rough terrain in a Jeep Grand Cherokee.

Chrysler NAG1/A580 Transmissions (2005-2019)

Introduced in 2005, the NAG1 transmission series, also known by its model number W5A580, or simply A580, represented an advancement in Chrysler's approach to automatic transmissions for rear-wheel and all-wheel-drive vehicles. 

This five-speed gearbox featured adaptive electronics such as variable line pressure and manual mode capabilities, enhancing shift quality and responsiveness. Its versatility made it a perfect match for the performance-oriented Dodge Charger and the refined Chrysler 300, among others, balancing power delivery with fuel efficiency. 

The NAG1's durability and smooth operation have cemented its reputation, making it a valued component in a range of vehicles, including luxury sedans, full-size SUVs, and even police-spec performance models.

Reliability & Common Issues

When it comes to reliability, Chrysler's transmissions have a varied track record, each with its own set of common issues and strengths.
The TorqueFlite series is generally regarded for its durability, yet it's not immune to the typical aging woes like seal and gasket leaks and failure due to incorrect fluid levels or pressure.
The Ultradrive series faced early reliability issues, often due to drivers using incorrect fluid and misconceptions over its "limp home" mode.
Subsequent models like the 41TE aimed to enhance reliability with updated components and technology. The 68RFE is robust for heavy-duty use but has problems like torque converter and oil pump malfunctions.
The NAG1 series operates smoothly but requires meticulous maintenance to avoid issues like "Limp Mode" due to low fluid or valve problems.
Ultimately, regular maintenance and attentive care, such as ensuring correct fluid levels and addressing any irregularities promptly, can greatly prolong the lifespans of late-model Chrysler transmissions.

Transmission Quick Guide Charts

Chrysler Transmission Naming Codes Explained

ZF Torque Factors

Gear Ratios

Weights

JEGS: For All Your Automotive Needs

And there you have it, the full rundown on late-model automatic Chrysler transmissions; we hope you enjoyed the read.
For all your automotive needs, consider JEGS, a leading supplier of performance car parts and accessories. Feel free to browse our massive inventory and complete your order online. Still have questions? Contact our team today.