Product Description
The SUNCOAST 618-37-BIS-COMBO 37 SPLINE SOLID BILLET INPUT SHAFT TORQUE CONVERTER KIT is a premium transmission upgrade package engineered for high-horsepower 47RE and 48RE Dodge Cummins transmissions. Designed to eliminate common input shaft and converter clutch failures, this complete package combines a heavy-duty billet triple-disc torque converter with a 37 spline solid billet input shaft for maximum durability and power handling.
SunCoast designed this kit specifically for extreme towing, sled pulling, drag racing, competition diesel trucks, and high-performance street applications where factory transmission components become a reliability concern. The upgraded billet shaft design eliminates stress risers found in factory shafts while improving torsional dampening and bearing support.
The included SunCoast triple-disc billet converter features reinforced furnace-brazed fins, billet stator options, a dampened apply piston, and proprietary clutch technology designed for improved lockup holding power and converter reliability under extreme torque loads.
FEATURES
- Complete 37 spline billet input shaft and torque converter package
- Designed for Dodge Cummins 47RE and 48RE transmissions
- Includes SunCoast triple-disc billet torque converter
- Billet 37 spline solid input shaft included
- Billet 37 spline stator support
- 4140 billet impeller hub construction
- Reinforced TIG-welded furnace-brazed fins
- Improved torsional dampening and bearing support
- Eliminates stress concentrations found in factory shafts
- Ideal for towing, racing, sled pulling, and high-horsepower diesel builds
- Multiple stall speed options available
FITMENT
- 1994-2007 Dodge Ram 2500/3500 5.9L Cummins equipped with 47RE transmission
- 2003-2007 Dodge Ram 2500/3500 5.9L Cummins equipped with 48RE transmission
- High-performance and competition diesel transmission builds
Fitment Note: Professional transmission installation is strongly recommended. Stall speed selection may vary depending on turbocharger size, horsepower goals, and intended vehicle use.
WHAT'S INCLUDED
- SunCoast Triple-Disc Billet Torque Converter
- 37 spline solid billet input shaft
- Billet 37 spline stator support
- SunCoast dampened apply piston
- Billet stator of choice
- 4140 billet impeller hub
- Proprietary SunCoast clutch components
CROSS-REFERENCE & RELATED PRODUCTS
- SUNCOAST 618-HSX 23 SPLINE BILLET INPUT SHAFT
- SUNCOAST 618-BOS-29 BILLET OUTPUT SHAFT
- SUNCOAST 47RE CATEGORY 3 REBUILD KIT
- ATS BILLET FLEXPLATE FOR 47RE/48RE
- DODGE CUMMINS TRANSMISSION PARTS
WHY UPGRADE TO A 37 SPLINE BILLET INPUT SHAFT?
Factory transmission input shafts are one of the most common failure points in high-torque Cummins applications. Increased towing loads, upgraded injectors, larger turbochargers, and aggressive tuning can quickly exceed factory shaft limits. The SunCoast billet shaft system dramatically improves torque capacity, lockup durability, and long-term transmission reliability.
SPECIFICATIONS
| Specification | Details |
|---|---|
| Manufacturer | SunCoast Diesel |
| Part Number | 618-37-BIS-COMBO |
| Transmission Compatibility | 47RE / 48RE |
| Spline Count | 37 Spline |
| Converter Style | Triple-Disc Billet Torque Converter |
| Input Shaft Material | Ultra high-strength VAR alloy billet steel |
| Impeller Hub | 4140 billet steel |
| Transmission Application | High-performance towing, racing, sled pulling |
| Shipping Weight | Approximately 94 lbs |
| Core Charge | Applicable depending on configuration |
| Prop 65 | Warning: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. |
FAQ
What transmissions does the 618-37-BIS-COMBO fit?
This kit is designed for Dodge Cummins 47RE and 48RE automatic transmissions commonly found in 1994-2007 Ram diesel trucks.
Why upgrade to a 37 spline billet input shaft?
The larger 37 spline billet shaft provides substantially greater torque capacity and durability compared to factory input shafts, especially in high-horsepower diesel applications.
What type of torque converter is included?
The kit includes a SunCoast triple-disc billet torque converter with reinforced fins, billet stator support, and proprietary clutch technology for improved lockup performance.
Is this kit recommended for towing and racing?
Yes. The 618-37-BIS-COMBO is specifically engineered for towing, sled pulling, drag racing, competition diesel trucks, and high-performance street applications.
