Comparing 5R55S, 5R55E, 5R55N, and 5R55W Transmissions Side-by-Side
The Ford 5R55 series encompasses several five-speed automatic transmissions, each tailored for specific applications and performance requirements.
5R55E:
The 5R55E, introduced in 1997, was the first five-speed automatic transmission employed by an American automaker. It features a simpler valve body and is electronically controlled. This transmission was commonly found in vehicles like the Ford Ranger, Explorer, and Aerostar.
Common issues include shift flare and solenoid failures. While it is less durable due to its simpler design, maintenance is relatively easier and cost-effective
5R55N:
The 5R55N variant appeared in the early 2000s, specifically in models such as the Jaguar S-Type, Lincoln LS, and the 2002 Ford Thunderbird.
It shares the foundational design of the 5R55 series but incorporates specialised controls and gear ratios suited to luxury vehicles.
The 5R55N is similar to the W and S models, but only a few parts are interchangeable
5R55W:
The 5R55W, where “W” stands for “wide ratio,” was introduced around 2002 and was utilized in vehicles like the Ford Explorer and Ford Ranger.
This transmission offers wider gear ratios, enhancing performance characteristics such as towing capacity and fuel efficiency.
However, it is prone to issues like shift flare, overheating, and wear. Maintenance is more complex and may incur higher repair costs.
5R55S:
The 5R55S, introduced in 2003, was designed for sportier applications, with the “S” denoting its performance orientation. It features Ford’s SelectShift option, allowing drivers to manually select gears without a clutch, mimicking a manual transmission experience.
This transmission was used in vehicles like the 2005-2010 Ford Mustang and the 2003 Ford Thunderbird. Common issues include shift flare, overheating, and wear. Despite being more advanced, it is still prone to these problems, and maintenance can be more complex with higher repair costs.
Below is a detailed comparison of the 5R55E, 5R55N, 5R55W, and 5R55S transmissions:
| Feature | 5R55E | 5R55N | 5R55W | 5R55S |
|---|---|---|---|---|
| Introduction Year | 1997 | Early 2000s | 2002 | 2003 |
| Design | Simpler valve body, less advanced | Similar to W/S models, few interchangeable parts | Wider gear ratios, heavier duty | More complex, adaptive learning |
| Applications | Ford Ranger, Explorer, Aerostar | Jaguar S-Type, Lincoln LS, 2002 Ford Thunderbird | Ford Explorer, Ford Ranger | 2005-2010 Ford Mustang, 2003 Ford Thunderbird |
| Control System | Electronic | Electronic | Electronic | Electronic with SelectShift |
| 1st Gear Ratio | 2.47 | Not specified | 3.22 | 3.22 |
| 2nd Gear Ratio | 1.86 | Not specified | 2.29 | 2.29 |
| 3rd Gear Ratio | 1.47 | Not specified | 1.55 | 1.55 |
| 4th Gear Ratio | 1.00 | Not specified | 1.00 | 1.00 |
| 5th Gear Ratio | 0.75 | Not specified | 0.75 | 0.71 |
| Reverse Ratio | 2.10 | Not specified | Not specified | Not specified |
| Common Issues | Shift flare, solenoid failures | Not specified | Shift flare, overheating, wear | Shift flare, overheating, wear |
| Durability | Less durable, simpler | Not specified | Heavier duty but still prone to issues | More advanced but prone to issues |
| Maintenance | Easier and cheaper to repair | Not specified | Similar to 5R55S, higher repair costs | More complex, higher repair costs |
This table highlights the key differences and similarities among the 5R55 transmission variants, illustrating their evolution and specific applications within Ford’s vehicle lineup.
Rebuilding The Ford 5R55 Series Transmissions:
Rebuilding the Ford 5R55 series transmissions—encompassing models like the 5R55E, 5R55N, 5R55W, and 5R55S—can be a cost-effective alternative to purchasing a new or remanufactured unit. However, it’s essential to assess whether a rebuild is the right choice for your situation.
Is Rebuilding Worth It?
Rebuilding your 5R55 transmission can be worthwhile if:
- Cost Considerations: Rebuilding is often less expensive than buying a new or remanufactured transmission.
- Vehicle Condition: If your vehicle is in good overall condition and you plan to keep it for an extended period, investing in a rebuild can extend its lifespan.
- Customization: A rebuild allows for the installation of upgraded components that may enhance performance and durability.
However, if the transmission case is cracked or severely damaged, or if you’re not experienced with transmission work, a rebuild might not be the best option. In such cases, consulting with a professional or considering a replacement could be more appropriate.
Rebuild Kits
Several manufacturers offer comprehensive rebuild kits for the 5R55 series. These kits typically include components such as friction and steel clutch plates, bands, filters, gaskets, seals, and bushings. For example, Raybestos Powertrain provides a Super Rebuild Kit for the 5R55S/5R55W models, which includes:
- OE replacement friction and steel clutch plates
- Bonded pistons
- Flex band
- OEM quality filter
- Overhaul kit with OE reusable gasket with metal torque limiters
- Bushing kit
This kit is designed for 2002-2007 models and aims to meet or exceed original equipment specifications.
Rebuilding Process
Rebuilding a transmission is a complex task that requires technical expertise, specialized tools, and meticulous attention to detail. The general steps involved include:
- Diagnosis: Confirm that a rebuild is necessary by diagnosing the specific issues affecting the transmission.
- Removal: Carefully remove the transmission from the vehicle, following manufacturer guidelines to avoid damage to surrounding components.
- Disassembly: Systematically disassemble the transmission, keeping track of all parts and noting their condition.
- Inspection: Examine all components for wear, damage, or defects. Determine which parts need replacement or refurbishment.
- Cleaning: Thoroughly clean all reusable parts to remove debris, sludge, and contaminants that could affect performance.
- Replacement: Install new components from the rebuild kit, such as clutch plates, seals, and gaskets. Ensure that all parts are correctly fitted and torqued to specifications.
- Reassembly: Reassemble the transmission in the reverse order of disassembly, taking care to follow proper procedures and specifications.
- Testing: Before reinstalling, test the transmission on a bench to ensure that it operates correctly. After installation, perform a road test to confirm proper function under load.
For detailed guidance, service manuals are invaluable resources. The Automatic Transmission Service Group (ATSG) offers comprehensive manuals for various 5R55 models, providing step-by-step instructions, diagrams, and specifications. For instance, the ATSG manual for the 5R55E includes information on general operation, disassembly, component rebuilding, and reassembly procedures.
Additional Considerations
Tools: Ensure you have all necessary tools, including specialized transmission tools, to perform the rebuild accurately.
Work Environment: A clean, organized workspace is crucial to prevent contamination and keep track of components.
Technical Expertise: If you’re not experienced in transmission rebuilding, consider seeking assistance from a professional or enrolling in a training course to build your skills.
Quality of Parts: Use high-quality replacement parts to ensure the longevity and reliability of the rebuilt transmission.
By carefully considering the factors above and utilising available resources, you can make an informed decision and approach the rebuild process with confidence.
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