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5.9L / 6.7L Diesel Transmission Upgrades

5.9L and 6.7L diesel engines are known for their exceptional torque and towing capabilities, powering Ram trucks with proven reliability and strength. The 5.9L Magnum diesel offers classic Mopar durability, while the 6.7L Cummins delivers modern turbocharged power and advanced torque management. This collection features transmission upgrades designed specifically for these diesel platforms, helping you handle increased torque loads and improve drivetrain longevity. Whether you’re towing heavy loads or pushing your diesel for performance, these parts enhance shifting smoothness, durability, and overall transmission efficiency. Key benefits of upgrading your diesel transmission include: - Enhanced torque capacity for heavy-duty towing - Improved shift quality and response - Increased transmission durability under load - Compatibility with 5.9L Magnum and 6.7L Cummins diesel engines Shop 5.9L and 6.7L diesel transmission upgrades at FastHemis.
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131 Results

Revolution Gear & Axle 4.10 Ratio Gear Package: Dodge Ram 1500 (94-01) / Dakota (97-04)
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Revolution Gear & Axle 4.10 Ratio Gear Package: Dodge Ram (94-01)

Revolution Gear & Axle

$865.99

Unit price
per 

Eaton ELocker4 Dana 60 Performance 35 Spline Differential: Dodge Ram 2500 / Ram 3500 (1994-2000)
Eaton ELocker4 Dana 60 Performance 35 Spline Differential: Dodge Ram 2500 / Ram 3500 (1994-2000)
Eaton ELocker4 Dana 60 Performance 35 Spline Differential: Dodge Ram 2500 / Ram 3500 (1994-2000)
Eaton ELocker4 Dana 60 Performance 35 Spline Differential: Dodge Ram 2500 / Ram 3500 (1994-2000)
Eaton Helical LSD Detroit Truetrac Diff 31 Spline (REAR): Fits Dodge / Chrysler (94-10)
Eaton Helical LSD Detroit Truetrac Diff 31 Spline (REAR): Fits Dodge / Chrysler (94-10)

Eaton Helical LSD Detroit Truetrac Diff 31 Spline (REAR): Fits Most Chrysler/Dodge (92-10)

Eaton

Regular price $891.29 $819.99 8% off

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per 

Eaton Helical Gear LSD 30 Spline (REAR): Dodge Ram 2500 / 3500 (94-02)
Eaton Helical Gear LSD 30 Spline (REAR): Dodge Ram 2500 / 3500 (94-02)

Eaton Helical Gear LSD 30 Spline (REAR): Dodge Ram 2500/Ram 3500 94-02 8.0L/5.9L Diesel/5.7L/5.2L

Eaton

Regular price $1,358.69 $1,249.99 8% off

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Eaton Master Install Kit (FRONT AND REAR): Dodge Ram 1500 / Ram 2500 / Ram 3500 1994-2002
Wehrli Gloss Black Rear Diff Cover: Dodge Ram 2500 (2003-2018) / Ram 3500 (2003-2018)
Wehrli Gloss Black Rear Diff Cover: Dodge Ram 2500 (2003-2018) / Ram 3500 (2003-2018)
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Wehrli Gloss Black Rear Diff Cover: Fits Most Dodge/Ram 6.7L Diesel/5.9L Diesel (03-18)

Wehrli

Regular price $389.00 $377.33 3% off

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Wehrli Gloss Black Rear Differential Cover: Ram 2500 / Ram 3500 (19-24)
Wehrli Gloss Black Rear Differential Cover: Ram 2500 / Ram 3500 (19-24)
usa

Wehrli Gloss Black Rear Differential Cover: Ram 2500 / 3500 19-24 6.7L Diesel/6.4L

Wehrli

Regular price $389.00 $377.33 3% off

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per 

Wehrli Rear Differential Cover (REAR): Ram 2500 / 3500 2019-2024 w/ Grey
Wehrli Rear Differential Cover (REAR): Ram 2500 / 3500 2019-2024 w/ Grey
usa

Wehrli Rear Differential Cover (REAR): Ram 2500 / 3500 19-24 6.7L Diesel/6.4L w/ Grey

Wehrli

Regular price $414.00 $401.58 3% off

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Wehrli Gloss White Rear Differential Cover: Ram 2500 / Ram 3500 2019-2024
Wehrli Gloss White Rear Differential Cover: Ram 2500 / Ram 3500 2019-2024
usa

Wehrli Gloss White Rear Differential Cover: Ram 2500 / 3500 19-24 6.7L Diesel/6.4L

Wehrli

Regular price $389.00 $377.33 3% off

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per 

Wehrli Red Rear Differential Cover: Ram 2500 / 3500 (19-24)
Wehrli Red Rear Differential Cover: Ram 2500 / 3500 (19-24)
usa

Wehrli Red Rear Differential Cover: Ram 2500 / 3500 19-24 6.7L Diesel/6.4L

Wehrli

Regular price $414.00 $401.58 3% off

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per 

Mishimoto Cast Transmission Pan: Fits Dodge / Jeep (01-23) - Gunmetal Gray
Mishimoto Cast Transmission Pan: Fits Dodge / Jeep (01-23) - Gunmetal Gray

Mishimoto Cast Transmission Pan Gunmetal Gray (BOTTOM): Fits Ram 2008-2023 6.7L Diesel

Mishimoto

Regular price $417.00 $378.95 9% off

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Fleece Performance PowerFlo 750: Dodge Ram 2500 / Ram 3500 2004-2007
Fleece Performance PowerFlo 750: Dodge Ram 2500 / Ram 3500 2004-2007
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Fleece Performance PowerFlo 750: Dodge Ram 2500 / Ram 3500 2007-2010 / 2011-2014
Fleece Performance PowerFlo 750: Dodge Ram 2500 / Ram 3500 2007-2010 / 2011-2014
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Fleece Performance CP3K Fuel Pump: Dodge Ram 2500 / Ram 3500 2007-2014
Fleece Performance CP3K Fuel Pump: Dodge Ram 2500 / Ram 3500 2007-2014
usa
ATS Diesel Signal Conditioner: Dodge Ram 2500 / Ram 3500 1998-2002
ATS Diesel Signal Conditioner: Dodge Ram 2500 / Ram 3500 1998-2002
usa
ARB Airlocker 33 Spl S/N: Dodge Ram 2500 (2003-2010) / Ram 2500 (2011-2019) / Dodge Ram 3500 (2003-2010) / Ram 3500 (2011-2019)
ARB Airlocker 33 Spl S/N: Dodge Ram 2500 (2003-2010) / Ram 2500 (2011-2019) / Dodge Ram 3500 (2003-2010) / Ram 3500 (2011-2019)
ARB Airlocker AAM 925/950 33 Spline: Dodge Ram 2500 (2003-2010) / Ram 2500 / Ram 3500 (2011-2020)
ARB Airlocker AAM 925/950 33 Spline: Dodge Ram 2500 (2003-2010) / Ram 2500 / Ram 3500 (2011-2020)
Exedy Stage 1 Organic Clutch: Dodge Ram 2500 / Ram 3500 2005 - 2010
Exedy Stage 1 Organic Clutch: Dodge Ram 2500 / Ram 3500 2005 - 2010

Exedy Stage 1 Organic Clutch: Dodge Ram 2500 / Ram 3500 05-10 6.7L Diesel/5.9L Diesel

Exedy

Regular price $1,339.45 $1,138.50 15% off

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Exedy Stage 2 Cerametallic Clutch w/ Cushion Button Disc: Dodge Ram 2500 / Ram 3500 2005 - 2010
Exedy Stage 2 Cerametallic Clutch w/ Cushion Button Disc: Dodge Ram 2500 / Ram 3500 2005 - 2010
Exedy Stage 1 Organic Clutch: Dodge Ram 2500 / Ram 3500 2001 - 2004
Exedy Stage 1 Organic Clutch: Dodge Ram 2500 / Ram 3500 2001 - 2004

Exedy Stage 1 Organic Clutch: Dodge Ram 2500 / Ram 3500 01-04 5.9L Diesel

Exedy

Regular price $749.23 $636.83 15% off

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per 

Exedy Stage 2 Cerametallic Clutch w/ Cushion Button Disc: Dodge Ram 1500 (04) / Ram 2500 (01-04) / Ram 3500 (01-04)
Exedy Stage 2 Cerametallic Clutch w/ Cushion Button Disc: Dodge Ram 1500 (04) / Ram 2500 (01-04) / Ram 3500 (01-04)

Durable Transmission Upgrades for 5.9L Magnum and 6.7L Cummins Diesel Engines

The 5.9L Magnum and 6.7L Cummins diesel engines are built to deliver exceptional torque and towing strength in Ram trucks. These transmissions face intense stress from heavy loads and high torque output, making specialized upgrades essential for maintaining smooth shifting and long-term drivetrain reliability.

How transmission upgrades enhance torque handling on 5.9L and 6.7L diesels

Both the 5.9L Magnum and 6.7L Cummins engines generate substantial torque that can overwhelm stock transmission components over time. Upgrading with heavy-duty clutches, reinforced gears, and improved valve bodies helps these transmissions withstand increased torque loads while reducing wear and heat buildup.

  • Strengthened internal components resist clutch slippage and gear failure
  • Improved hydraulic circuits enhance shift firmness and response
  • Upgraded cooling solutions prevent overheating under heavy towing
  • Compatibility tailored to 5.9L Magnum and 6.7L Cummins transmissions

Key considerations when selecting transmission upgrades for diesel trucks

Choosing the right transmission upgrade depends on your truck’s usage, whether heavy towing, off-road hauling, or performance driving. It’s important to match upgrades to your engine’s torque curve and intended load to ensure reliable operation without sacrificing drivability or shift quality.

Shop 5.9L and 6.7L diesel transmission upgrades at FastHemis

FastHemis offers a range of transmission upgrade components designed specifically for the 5.9L Magnum and 6.7L Cummins diesel platforms. Enhance your Ram truck’s towing capability and drivetrain durability with parts engineered for these torque-heavy engines. Browse our collection to find the right transmission solutions for your diesel build.

SELECT YOUR VEHICLE