5R55E Transmission Specs, Issues, Fixes, and More
The 5R55E transmission was developed by Ford and used in several popular vehicles, including the Ford Explorer, Ranger, and Mustang. While it’s known for its smooth shifting and efficiency, it also has a reputation for certain reliability issues.
This blogpost covers all about 5R55E Transmission including specs, common problems, fixes, maintenance tips, and more to help you understand and care for your 5R55E transmission.
Reading Tip: Use our Transmission Glossary to Understand Transmission Terms
What is the 5R55E Transmission?
The 5R55E is an electronically controlled 5-speed automatic transmission designed for Ford’s V6 engines. It’s part of the 5R55 family, which includes the 5R55W, 5R55S, and 5R55N. The “E” in its name stands for “Electronic,” indicating its reliance on the Powertrain Control Module (PCM) for shift timing and pressure control.
The Specs of 5RR5E transmission are:
| Specification | Details |
|---|
| Type | 5-speed automatic transmission |
| Introduced | Early 2000s |
| Applications | Ford Explorer, Ford Mustang, Mazda B-Series, Lincoln Aviator, and more |
| Torque Capacity | Up to 500 lb-ft of torque |
| Fluid Type | Dexron VI Automatic Transmission Fluid |
| Total Fluid Capacity | Approx. 9 liters |
| Fluid Change Capacity | Approx. 3 liters |
| 1st Gear Ratio | 3.23:1 |
| 2nd Gear Ratio | 1.98:1 |
| 3rd Gear Ratio | 1.40:1 |
| 4th Gear Ratio | 1.00:1 |
| 5th Gear Ratio | 0.71:1 |
| Reverse Gear Ratio | 3.23:1 |
Common 5R55E Transmission Issues
Like any automatic transmission, the 5R55E is prone to several issues that can affect its performance and longevity. These are the most common problems associated with this transmission.
1. Overheating
Overheating is one of the most common problems that can cause a 5R55E transmission to fail prematurely. It’s often a result of:
- Low Fluid Levels: Insufficient fluid can lead to inadequate lubrication and cooling.
- Malfunctioning Cooling System: If the transmission cooler isn’t working correctly, the transmission may overheat under heavy load conditions.
Symptoms of Overheating:
- Slipping gears
- Erratic shifting
- Strange smells or smoke from the engine bay
2. Solenoid Failures
Solenoids control fluid flow within the transmission, and when they fail, you may experience:
- Harsh Shifting: Shifting from one gear to another may feel rough.
- Delayed Shifting: There could be noticeable delays when shifting between gears.
Common Causes:
- Wear and tear from extended use
- Electrical issues or wiring problems
3. Torque Converter Problems
The torque converter helps transfer power from the engine to the transmission, and any issues here can cause:
- Slipping: The engine RPM increases without corresponding acceleration.
- Stalling: The vehicle may stall while idling or during low-speed operation.
4. Valve Body Problems
The valve body directs transmission fluid to the appropriate gears. If there are issues with the valve body, you may face:
- Delayed Engagement: The transmission takes longer to engage the gear.
- Harsh or Irregular Shifting: Gears may shift too early or late, resulting in rough transitions.
5. Band and Clutch Wear
- Cause: The intermediate and overdrive bands, as well as the clutches, can wear out over time.
- Symptoms: Slipping, harsh shifts, or failure to engage overdrive.
- Fix: Adjust or replace the bands and clutches during a rebuild.
6. Servo Bore Wear
Servo bore wear occurs when hardened steel servo shafts wear out the aluminum casing, causing:
- Slipping: The transmission may fail to hold a gear or shift too early.
- Erratic Shifting: Unpredictable shifting behavior, especially under load.
Fixing the 5R55E Transmission Issues
If you’re experiencing any of the common problems listed above, there are several potential fixes you can try. Here’s a breakdown:
1. Regular Fluid and Filter Changes
Regular maintenance is key to prolonging the life of your 5R55E transmission. Change the fluid and filter every 30,000 to 60,000 miles, depending on usage and driving conditions.
- Fluid Type: Always use Dexron VI ATF to ensure compatibility.
- Fluid Capacity: Ensure you add the correct amount of fluid when performing a change.
2. Cooling System Maintenance
To prevent overheating:
- Ensure that the transmission cooler is functioning properly.
- Consider installing an auxiliary transmission cooler if you drive in heavy traffic or tow frequently.
3. Solenoid Replacement
If solenoid failure is suspected, it’s relatively easy to replace:
- Location: The solenoids are located inside the transmission valve body.
- Tools Needed: Transmission jack, socket wrench set, and a new set of solenoids.
4. Replacing the Torque Converter
If the torque converter is causing slipping or stalling, replacing it is a good option:
- Signs of Failure: Increased engine RPM without corresponding acceleration.
- Replacement Process: This typically involves removing the transmission from the vehicle and swapping out the old torque converter with a new one.
5. Valve Body and Servo Bore Fixes
If you’re dealing with valve body or servo bore wear, the fixes may involve:
- Valve Body Replacement: Sometimes, the valve body needs to be replaced entirely.
- Servo Bore Repair: Ford recommends machining the bores and adding brass inserts to prevent further wear.
5R55E Transmission Maintenance Tips
Proper maintenance can significantly extend the life of your 5R55E transmission. Here are some key tips:
Regular Fluid Changes: Replace the transmission fluid and filter every 30,000–60,000 miles using Dexron VI ATF.
Inspect for Leaks: Check for leaks at the transmission pan, input/output shaft seals, and cooler lines.
Monitor Fluid Condition: Look for signs of burnt or discolored fluid, which indicate overheating or internal wear.
Install a Cooler: Add an auxiliary transmission cooler if you frequently tow or drive in hot climates.
Address Issues Early: If you notice slipping, harsh shifts, or delayed engagement, have the transmission inspected promptly.
Common Questions Answered:
1. What vehicles use the 5R55E transmission?
The 5R55E was used in the Ford Explorer (1997–2001), Ford Ranger (1998–2009), Ford Mustang (1998–2004), and Mercury Mountaineer (1997–2001).
2. What fluid does the 5R55E use?
The 5R55E requires Mercon V or Mercon SP transmission fluid. Using the wrong fluid can cause damage.
3. How do I know if my 5R55E is failing?
Common signs of failure include slipping gears, harsh shifts, delayed engagement, and Check Engine Light codes related to the transmission.
4. Can I tow with a 5R55E transmission?
Yes, but it’s important to install an auxiliary cooler and avoid exceeding the transmission’s torque capacity.
5. How long does a 5R55E transmission last?
With proper maintenance, the 5R55E can last 150,000–200,000 miles. Neglecting maintenance can significantly reduce its lifespan.
Sources: Wikipedia, Transmissiontroublehub