A518 Transmission: History, Common Problems, and Replacement Options

The A518 transmission, also known as the 46RH/46RE, is a classic automatic overdrive transmission found in Dodge trucks and vans throughout the late 1980s and early 2000s. While it was a solid workhorse at the time, many owners have encountered issues as these transmissions age. In this article, we’ll cover the history of the A518, its common problems, and where to find the best replacement options for your Dodge vehicle.

A Brief History of the A518 Transmission

The A518 debuted thanks to Chrysler in 1988, serving as an exciting evolution of the beloved classic Torqueflite 727 (TF727) transmission. While the TF727 was known for its durability and a popular choice as a 3-speed automatic, it didn’t quite offer overdrive, which is essential for fuel efficiency and those long highway drives!

Chrysler enhanced the foundation of the TF727 by introducing a fourth overdrive gear, resulting in the impressive A518. This transmission was home in the robust Dodge Ram 1500, 2500, and 3500 trucks, along with select Dodge Dakota and Dodge Durango models. It was offered in two exciting variations:

• 46RH (Hydraulic) – Used from 1988-1995

• 46RE (Electronic) – Used from 1996-2003

The main difference between the two versions is that the RH version used a hydraulic governor for shifting. In contrast, the RE version relied on electronic controls for improved precision and adaptability.

Common Problems with the A518 Transmission

Like any transmission, the A518 has its share of weaknesses. As these units age, drivers often report several common issues, including:

1. Overdrive Failure

Since overdrive was a major addition to this transmission, it’s also one of its biggest weak points. The overdrive unit can wear out, leading to slipping or complete failure of 4th gear. Overheating and lack of maintenance often accelerate this issue.

2. Torque Converter Lockup Problems

A failing torque converter clutch (TCC) can cause shuddering or improper lockup, leading to poor drivability and fuel economy. This issue is more common in the 46RE electronic version.

3. Valve Body Issues

The valve body controls shifting, and problems here can cause delayed or harsh shifting, slipping, or erratic gear changes. Many drivers opt for aftermarket shift kits to improve performance and longevity.

4. Governor Pressure Solenoid & Sensor Failure (46RE Models)

In electronically controlled versions, the governor pressure solenoid and sensor can wear out, leading to erratic shifting or limp mode. Replacing these components often restores proper operation.

5. Leaks & Overheating

The A518 is known to run hot, especially in heavy-duty applications. Heat is the enemy of any automatic transmission, and without proper cooling, fluid breakdown can lead to slipping, premature wear, and internal damage.

Should You Rebuild or Replace an A518?

If you’re experiencing issues with your A518 transmission, you may be debating whether to rebuild or replace it. While rebuilding is an option, it can be costly—especially if you need upgraded components to handle more power or towing demands.

Instead of rebuilding, many Dodge truck owners upgrade to a stronger, remanufactured transmission. If you’re looking for a reliable replacement for your Dodge transmission, check out our selection of high-performance Dodge transmissions here:

Shop Dodge Transmissions

Whether you’re towing, daily driving, or building a performance truck, having a reliable transmission is key to keeping your Dodge on the road. Contact our team for expert advice if you need help selecting the right unit!