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Thumbnail Filmstrip of 6.7 Cummins 48RE Cat 1 Rebuild Kit with Triple Disc Converter Suncoast SC-68-1 Images
Your 2008-2018 6.7L Cummins is a powerhouse, but the factory 68RFE transmission has well-documented weaknesses that limit its true potential, especially when towing heavy loads or running aftermarket tuners. The 68RFE, a fully electronic-controlled evolution of Chrysler's RFE platform, was a significant step up from the older 48RE, boasting six forward gears, higher 1st -gear ratios (3.23:1 vs. the 48RE’s 2.45:1), and dual overdrive gears for tighter shift recovery, better torque multiplication, and improved efficiency. However, increasing engine output inevitably stresses its fragile components, leading to burnt clutches and premature failure. The SunCoast SC-68-1 Category 1 Rebuild Kit with Triple Disc Converter is the ultimate systematic solution, providing proven, high-performance 'recipes' used in our own facility to transform your transmission into a rugged, reliable workhorse built to handle the demands of heavy-duty use. This comprehensive kit targets and eliminates every common failure point in the 68RFE, ensuring your truck delivers reliable power for years to come.
The SunCoast Category 1 kit includes critical, high-quality components designed for exceptional performance and longevity:
- SunCoast Triple Disc Torque Converter: Engineered for heavy-duty towing and hauling (not racing), this converter features furnace-brazed fins, hardened turbine splines, and carbon-graphitic clutches for precise, accurate lock-up and vastly improved vehicle response and reliability over the factory unit.
- Sonnax Smart Tech Overdrive Drum: The factory's thin, single-sided overdrive clutches are a major weak link. The billet Smart Tech drum holds a physically taller clutch pack, increasing the clutch apply area by 16%. Thicker clutches and steels also increase the clutch steel mass by 28%, drastically improving heat dissipation and virtually eliminating the distortion that leads to burnt clutches. It also features a top bolt-on plate to prevent clutch pack flexing.
- TransGo High Pressure Tuneless Reprogramming Kit: This revolutionary kit increases max line pressure to 210 psi (a 30% increase over the OEM 160 psi) by utilizing a new pressure regulator spring and triple valve body separator plate. This is achieved without the need for computer programming, eliminating the rough, erratic shifts and limp-in codes associated with conventional tuning. It also includes an integral converter clutch apply pressure bypass to prevent torque converter ballooning from the elevated pressure.
- Billet 2C Piston: Replaces the factory molded piston, which is prone to uneven apply. The new billet piston corrects this issue, ensures matched performance, and allows for the addition of one extra clutch to further increase surface apply area and heat management.
- Zero Cavitation Filter Kit (Specific OE Pan Included): Addresses the factory's unreliable plastic filter and pressure relief check valve system. This conversion allows the use of a robust Torqueflite filter, preventing pump cavitation and enabling a higher volume of fluid to pass through the system, which is crucial for improved flow in high line pressure situations.
- Sonnax Billet Aluminum Accumulator Pistons: Replaces the factory pistons, which are susceptible to scuffing and bore wear, especially under increased pressure. Made from 6061 billet aluminum, these feature dual-guide seals to prevent piston-to-bore contact and a relocated oil sealing ring to run in an unworn bore section, which can salvage moderately scuffed valve bodies and prevents failure from broken plastic pistons.
Investing in the SunCoast SC-68-1 Category 1 Rebuild Kit is an investment in the long-term reliability and performance of your Cummins. By systematically replacing or upgrading the most vulnerable components with superior, engineered parts—like the robust Sonnax Smart Tech Drum and the TransGo Tuneless Reprogramming Kit—you are providing your 68RFE with the strength it needs to reliably deliver the high horsepower and torque you expect. Drive confidently knowing your transmission has been reinforced with a proven combination of components that eliminate premature failure points and dramatically increase clutch and torque converter holding capacity.
Kit Includes:
- Sonnax Smart Tech Overdrive Drum Assembly
- 68RFE Thrust Washer Kit
- 68RFE Thrust Bearing Kit
- 68RFE Complete Gasket and Sealing Kit
- 68RFE Spin-on Filter
- 68RFE Pan Filter
- 68RFE Thrust Bearing Kit
- Upgraded 2C Clutch Set
- 68RFE Billet 2C Piston
- 68RFE Accumulator Plate Kit
- 4C Snap Ring Retainer
- Transgo 200 PSI Valve Body Kit (2007-2018 ONLY)
- Accumulator Piston Kit
- Zero Cavitation Filter Kit w/ Stock Pan
- 68RFE Triple-Disc Torque Converter
Note: Does NOT include a flex plate
Your 2008-2018 6.7L Cummins is a powerhouse, but the factory 68RFE transmission has well-documented weaknesses that limit its true potential, especially when towing heavy loads or running aftermarket tuners. The 68RFE, a fully electronic-controlled evolution of Chrysler's RFE platform, was a significant step up from the older 48RE, boasting six forward gears, higher 1st -gear ratios (3.23:1 vs. the 48RE’s 2.45:1), and dual overdrive gears for tighter shift recovery, better torque multiplication, and improved efficiency. However, increasing engine output inevitably stresses its fragile components, leading to burnt clutches and premature failure. The SunCoast SC-68-1 Category 1 Rebuild Kit with Triple Disc Converter is the ultimate systematic solution, providing proven, high-performance 'recipes' used in our own facility to transform your transmission into a rugged, reliable workhorse built to handle the demands of heavy-duty use. This comprehensive kit targets and eliminates every common failure point in the 68RFE, ensuring your truck delivers reliable power for years to come.
The SunCoast Category 1 kit includes critical, high-quality components designed for exceptiona[...]
Your 2008-2018 6.7L Cummins is a powerhouse, but the factory 68RFE transmission has well-documented weaknesses that limit its true potential, especially when towing heavy loads or running aftermarket tuners. The 68RFE, a fully electronic-controlled evolution of Chrysler's RFE platform, was a significant step up from the older 48RE, boasting six forward gears, higher 1st -gear ratios (3.23:1 vs. the 48RE’s 2.45:1), and dual overdrive gears for tighter shift recovery, better torque multiplication, and improved efficiency. However, increasing engine output inevitably stresses its fragile components, leading to burnt clutches and premature failure. The SunCoast SC-68-1 Category 1 Rebuild Kit with Triple Disc Converter is the ultimate systematic solution, providing proven, high-performance 'recipes' used in our own facility to transform your transmission into a rugged, reliable workhorse built to handle the demands of heavy-duty use. This comprehensive kit targets and eliminates every common failure point in the 68RFE, ensuring your truck delivers reliable power for years to come.
The SunCoast Category 1 kit includes critical, high-quality components designed for exceptional performance and longevity:
- SunCoast Triple Disc Torque Converter: Engineered for heavy-duty towing and hauling (not racing), this converter features furnace-brazed fins, hardened turbine splines, and carbon-graphitic clutches for precise, accurate lock-up and vastly improved vehicle response and reliability over the factory unit.
- Sonnax Smart Tech Overdrive Drum: The factory's thin, single-sided overdrive clutches are a major weak link. The billet Smart Tech drum holds a physically taller clutch pack, increasing the clutch apply area by 16%. Thicker clutches and steels also increase the clutch steel mass by 28%, drastically improving heat dissipation and virtually eliminating the distortion that leads to burnt clutches. It also features a top bolt-on plate to prevent clutch pack flexing.
- TransGo High Pressure Tuneless Reprogramming Kit: This revolutionary kit increases max line pressure to 210 psi (a 30% increase over the OEM 160 psi) by utilizing a new pressure regulator spring and triple valve body separator plate. This is achieved without the need for computer programming, eliminating the rough, erratic shifts and limp-in codes associated with conventional tuning. It also includes an integral converter clutch apply pressure bypass to prevent torque converter ballooning from the elevated pressure.
- Billet 2C Piston: Replaces the factory molded piston, which is prone to uneven apply. The new billet piston corrects this issue, ensures matched performance, and allows for the addition of one extra clutch to further increase surface apply area and heat management.
- Zero Cavitation Filter Kit (Specific OE Pan Included): Addresses the factory's unreliable plastic filter and pressure relief check valve system. This conversion allows the use of a robust Torqueflite filter, preventing pump cavitation and enabling a higher volume of fluid to pass through the system, which is crucial for improved flow in high line pressure situations.
- Sonnax Billet Aluminum Accumulator Pistons: Replaces the factory pistons, which are susceptible to scuffing and bore wear, especially under increased pressure. Made from 6061 billet aluminum, these feature dual-guide seals to prevent piston-to-bore contact and a relocated oil sealing ring to run in an unworn bore section, which can salvage moderately scuffed valve bodies and prevents failure from broken plastic pistons.
Investing in the SunCoast SC-68-1 Category 1 Rebuild Kit is an investment in the long-term reliability and performance of your Cummins. By systematically replacing or upgrading the most vulnerable components with superior, engineered parts—like the robust Sonnax Smart Tech Drum and the TransGo Tuneless Reprogramming Kit—you are providing your 68RFE with the strength it needs to reliably deliver the high horsepower and torque you expect. Drive confidently knowing your transmission has been reinforced with a proven combination of components that eliminate premature failure points and dramatically increase clutch and torque converter holding capacity.
Kit Includes:
- Sonnax Smart Tech Overdrive Drum Assembly
- 68RFE Thrust Washer Kit
- 68RFE Thrust Bearing Kit
- 68RFE Complete Gasket and Sealing Kit
- 68RFE Spin-on Filter
- 68RFE Pan Filter
- 68RFE Thrust Bearing Kit
- Upgraded 2C Clutch Set
- 68RFE Billet 2C Piston
- 68RFE Accumulator Plate Kit
- 4C Snap Ring Retainer
- Transgo 200 PSI Valve Body Kit (2007-2018 ONLY)
- Accumulator Piston Kit
- Zero Cavitation Filter Kit w/ Stock Pan
- 68RFE Triple-Disc Torque Converter
Note: Does NOT include a flex plate