Product Description
The REVMAX 478-931 Billet Low Reverse Servo is a heavy-duty upgrade designed to improve durability and reverse band engagement in 47RH, 47RE, and 48RE Dodge Cummins transmissions. Factory servos can flex or wear under higher torque loads, especially in trucks used for towing, racing, or heavy-duty work. The RevMax billet servo is precision-machined from high-strength billet aluminum to deliver stronger engagement and longer service life.
Upgrading to a billet servo helps maintain consistent apply pressure to the reverse band, improving reliability in high torque diesel applications. Whether you're rebuilding your transmission or adding durability upgrades, this RevMax component is designed to outperform the factory part.
Key Benefits
- Precision-machined billet aluminum construction
- Improves reverse band apply strength
- Reduces servo flex under high torque loads
- Excellent upgrade during transmission rebuilds
- Designed for heavy towing and performance diesel applications
Fitment
- 1994–1995 Dodge Ram 5.9L Cummins – 47RH Transmission
- 1996–2002 Dodge Ram 5.9L Cummins – 47RE Transmission
- 2003–2007 Dodge Ram 5.9L Cummins – 48RE Transmission
| Specifications for REVMAX 478-931 | |
|---|---|
| UPC | 193564455345 |
| GTIN | 193564455345 |
| Shipping Info | Shipping Weight: 2 lbs Package Dimensions: 8 in x 6 in x 4 in |
| Prop 65 | WARNING: Cancer & Reproductive Harm – www.P65Warnings.ca.gov |
FAQ
What does the low reverse servo do in a 47RE or 48RE transmission?The low reverse servo applies the reverse band inside the transmission, which is responsible for reverse gear operation and contributes to holding power in manual low gear.
Why upgrade to a billet servo?
Factory servos can flex or wear over time. A billet aluminum servo provides improved strength and helps maintain consistent band apply pressure in high torque diesel applications.
Is this a direct replacement for the factory servo?
Yes. The RevMax billet low reverse servo is designed as a direct replacement upgrade for factory components in compatible 47RH, 47RE, and 48RE transmissions.
Should this upgrade be installed during a transmission rebuild?
Yes. Installing upgraded billet servos during a rebuild is highly recommended to improve durability and reliability for towing and performance applications.
Will this help with reverse engagement issues?
If the factory servo is worn or flexing, upgrading to a billet servo can improve reverse band apply and engagement consistency.
