Best 68RFE Thermal Bypass Valve: Top 10 Reviewed Options

When I started really pushing my Cummins, especially when towing heavy, I noticed my 68RFE transmission temps were creeping up faster than I liked. The factory thermal bypass valve (TBV) design in the 68RFE is a known weak point—it restricts flow until the fluid is scorching hot, limiting cooling capacity when you need it most. We’ve spent time testing and reviewing options to find the best 68RFE thermal bypass valve upgrades that ensure maximum cooler flow right from startup, offering crucial protection for your transmission’s longevity.

IMAGE	PRODUCT NAME	AMAZON LINK
	ATS Diesel – 68RFE / AS69RC Thermal Bypass Valve Up-Grade…	View on Amazon
	Revmax Transmission Cooler Thermostatic Bypass Upgrade For…	View on Amazon
	68RFE / AS69RC Transmission Cooler Thermostatic Bypass…	View on Amazon
	Piping Hot Art Works Revmax 68RFE ZeroStat Transmission…	View on Amazon
	Revmax 68RFE Transmission Cooler Bypass Upgraded Kit for…	View on Amazon
	Transmission Thermal Bypass Valve For Dodge Ram 6.7L…	View on Amazon
	68RFE / AS69RC Transmission Thermal Bypass Valve Upgrade…	View on Amazon
	Hulyxayfave Upgraded 68RFE Thermal Bypass Valve with…	View on Amazon
	Transmission Cooler Thermostatic Bypass Valve Upgrade Fit…	View on Amazon
	Aosuracing 68RFE / AS69RC Transmission Thermal Bypass Valve…	View on Amazon

ATS Diesel – 68RFE / AS69RC Thermal Bypass Valve Up-Grade (3100052392)

The ATS thermal bypass upgrade is a highly respected name in the diesel performance world, designed to eliminate the inherent restrictions of the OEM thermal bypass valve. This kit is focused on maximizing fluid circulation to your cooler immediately, meaning your transmission benefits from full cooling potential right away. The inclusion of the billet aluminum filter coupler streamlines maintenance and adds an extra layer of durability to the system.

Key features that stand out:
– ATS Thermal Bypass: Complete replacement of the restrictive OEM valve.
– 2 Quick Release Cooler Line Fittings: Simplifies installation and future maintenance (check your year needed).
– ATS 68RFE Billet Aluminum Filter Coupler: Enhances the filtration system durability.

Pros:
– Complete kit including the essential billet filter coupler.
– Proven performance benefits from a trusted brand.
– Helps lower peak operating temperatures significantly.

Cons:
– Tends to be one of the higher-priced options due to the included components.

Best for: Owners seeking a comprehensive, high-quality cooling and filtration system upgrade from a top-tier manufacturer.

Expert Opinion: This ATS unit provides an excellent, holistic upgrade path. The combined thermal bypass and filter coupler addresses two common weak points in the 68RFE, offering outstanding long-term value.

Revmax Transmission Cooler Thermostatic Bypass Upgrade For 2013-2018 Dodge Ram 6.7L Cummins Diesel 68RFE

Revmax focuses on delivering a true ‘ZeroStat’ solution, completely removing the flow limitations imposed by the factory thermal element. This design allows you to flush your cooler lines easily using room-temperature fluid, a huge benefit for DIY mechanics or shops without specialized hot flush equipment. Its construction includes integral aluminum cooling fins, actively aiding in passive heat dissipation directly from the housing.

Key features that stand out:
– Eliminates Thermal Controlled Valve: No more risk of valve failure leading to transmission destruction.
– Immediate Cooler Cooling: Starts cooling the transmission fluid right away, not waiting for it to get hot.
– Integral Aluminum Cooling Fins: Aids in passive cooling of the housing and fluid.

Pros:
– Drastically simplifies cooler line flushing procedures.
– Reduces the risk associated with thermal valve malfunction.
– High-quality machining and durable aluminum construction.

Cons:
– Focused specifically on the 2013-2018 model years.

Best for: The conscientious owner performing their own maintenance who needs an easy, reliable way to flush cooler lines and maximize cooling capacity.

Expert Opinion: The focus on immediate cooling and the ability to flush without specialty tools makes this Revmax offering exceptionally practical. It directly addresses the primary frustration with the stock thermal bypass valve.

68RFE / AS69RC Transmission Cooler Thermostatic Bypass Upgrade For 2013-2018 Dodge Ram 6.7L Cummins Diesel Transmission Cooler Thermal Bypass Valve (TBV)

This bypass upgrade is designed specifically for the 2013–2018 6.7L Cummins models equipped with either the 68RFE or the Aisin AS69RC transmission. It aims to eliminate the inherent limitation of the stock thermal bypass valve that significantly reduces cooler flow during cold operation. By allowing immediate, unrestricted flow, this unit ensures lower operating temperatures and contributes to a longer transmission lifespan, backed by a solid one-year warranty.

Key features that stand out:
– Wide 2013-2018 Compatibility: Fits both 68RFE and AISIN AS69RC.
– Lifts Flow Restriction: Ensures immediate cooling for lower operating temperatures.
– Durable Construction: Made of high-quality aluminum for corrosion and aging resistance.

Pros:
– Straightforward, effective solution for better cooling.
– Attractive price point compared to full kits.
– Includes a 1-year warranty for peace of mind.

Cons:
– May require purchasing related O-rings or clips separately if not included.

Best for: Owners of 2013–2018 trucks who need a simple, cost-effective way to fix the factory cooling restriction issue.

Expert Opinion: For an entry-level upgrade, this unit delivers the critical performance benefit: maximizing flow from start-up. The material quality seems excellent for the price point.

Piping Hot Art Works Revmax 68RFE ZeroStat Transmission Cooler Thermostatic Bypass Upgrade with O-rings | Fits 2013-18 Models with ZeroStat Patented Tech | Crafted from Billet 6061 Aluminum

This unit leverages Revmax’s “ZeroStat Patented Tech” to ensure zero restriction and full cooler flow immediately. Constructed from robust Billet 6061 Aluminum, it is not only durable but also features integrated cooling fins for enhanced heat dissipation. The key benefit emphasized here is the elimination of bypass valve failure risk and the ability to perform a thorough, easy cooler flush without specialized hot equipment.

Key features that stand out:
– ZeroStat Patented Tech: Guarantees unrestricted fluid circulation immediately.
– Crafted from Billet 6061 Aluminum: Ensures durability and aids in passive cooling.
– Easy & Effective Transmission Flush: Allows flushing with room temperature fluid.

Pros:
– Excellent material quality and fitment precision.
– Zero-restriction design drastically reduces heat stress.
– Eliminates the most common failure point of the stock system.

Cons:
– The marketing name is quite long, but the product quality is high.

Best for: Those who prioritize high-end billet construction and the proven reliability of the Revmax ZeroStat design for 2013–2018 models.

Expert Opinion: The use of Billet 6061 aluminum with integrated fins makes this unit stand out from basic cast alternatives. It’s a premium mechanical solution to a common thermal problem.

Revmax 68RFE Transmission Cooler Bypass Upgraded Kit for 2013–2018 Ram 2500 3500 6.7L Cummins – Improves Cooler Flow by 87% – Includes 2 O-Rings & 2 Clips – Eliminates Thermal Valve Failure

Revmax claims a significant improvement in cooler flow—up to 87%—by removing the internal flow restrictions inherent in the OEM design. This kit is built for serious heavy-duty use, ensuring full-time cooler flow right from startup. Designed with a durable 6061 aluminum body and integrated cooling fins, this kit includes essential components (2 O-Rings and 2 Clips) to ensure a complete, leak-free installation, making it excellent value.

Key features that stand out:
– Increases Cooler Flow by 87%: Highly optimized internal geometry for maximum flow.
– Heat-Reducing 6061 Aluminum Body: Integrated fins dissipate heat efficiently.
– Includes 2 Premium O-Rings & 2 Clips: Comprehensive installation kit.

Pros:
– Quantifiable flow improvement (87%) provides clear performance gains.
– Complete hardware included for immediate installation.
– Excellent for towing and high-load applications.

Cons:
– Availability can sometimes be limited due to demand.

Best for: Truck owners running heavy loads who need a measurable increase in transmission fluid cooling capacity and component reliability.

Expert Opinion: The focus on the 87% flow increase is impressive. This unit doesn’t just bypass the valve; it optimizes the pathway, making it a crucial upgrade for anyone pushing the limits of their 68RFE.

Transmission Thermal Bypass Valve For Dodge Ram 6.7L Cummins 68RFE or AISIN AS69RC Transmission 2013-on,Thermostatic Valve Replace 3100052392 68186711AA 68186711AB(Orange 2013-2018)

This replacement unit offers a comprehensive compatibility range, fitting not only the 68RFE and AS69RC 2013-on but also various HEMI applications (545RFE, 65RFE, 66RFE) from 2003-2012, making it a versatile replacement option. It ensures 100% of the trans cooler flow is routed through the cooler, eliminating hot fluid recirculation issues. Installation is touted as a direct bolt-in replacement, simplifying the upgrade process significantly.

Key features that stand out:
– Broad Vehicle Compatibility: Fits multiple RFE transmissions, not just the 68RFE.
– Direct Bolt-In Replacement: Simplifies installation without line cutting.
– Ensures 100% Cooler Flow: Eliminates inefficient hot fluid recirculation.

Pros:
– Extremely broad compatibility across multiple years and transmission types.
– Affordable and effective solution for eliminating TBV problems.
– Made from sturdy, impact-resistant aluminum alloy.

Cons:
– The generic branding may deter some users seeking established performance names.

Best for: Truck owners needing an effective, affordable replacement that covers a wide range of model years and applications, including both diesel and some older gas RFE transmissions.

Expert Opinion: While not a “performance brand,” this unit delivers the core functional requirement of bypassing the flow restriction efficiently. The direct bolt-in nature is a huge time saver for installation.

68RFE / AS69RC Transmission Thermal Bypass Valve Upgrade with Billet Filter Coupler For 2019-2024 Dodge Ram 6.7L Cummins

Unlike many of the options geared toward the 2013-2018 chassis, this specific kit targets the newer 2019-2024 Ram trucks using the 68RFE or AS69RC transmission. It solves the common cooler flow limitations in the modern platform while including a durable billet filter coupler for enhanced fluid management. The design ensures optimal cooling efficiency in all conditions without negatively impacting engine warm-up times—a key consideration for newer, emissions-controlled diesels.

Key features that stand out:
– 2019-2024 Model Compatibility: Targets the newer generation of 6.7L Cummins trucks.
– Includes Billet Filter Coupler: Enhances filtration security and durability.
– High-Quality Aluminum Construction: Built to withstand modern diesel engine demands.

Pros:
– Addresses the specific needs and differences of the newer chassis.
– Ensures longevity by maximizing cooler flow immediately.
– Durable construction backed by a 1-year warranty.

Cons:
– Narrower application window (only 2019-2024).

Best for: Owners of 2019 and newer Ram 6.7L Cummins trucks who need the best 68RFE thermal bypass valve solution for their updated chassis.

Expert Opinion: It’s critical to use a product specifically designed for the 2019+ trucks due to system changes. This kit provides that necessary modern solution, pairing cooling flow with filtration security.

Hulyxayfave Upgraded 68RFE Thermal Bypass Valve with O-rings Fits for 2013-2018 Dodge Ram 2500 3500 6.7L Cummins with 68RFE or Aisin AS69RC, Replacement 3100052392

This upgraded TBV focuses on increased durability and protection. It features a unique “protective bar” designed to prevent accidental damage or interference during maintenance or operation, a thoughtful addition. The improved design guarantees 100% oil flow through the cooler even under low-temperature conditions, dramatically reducing the risk of transmission overheat. The kit comes complete with O-rings and clips, ensuring a smooth installation.

Key features that stand out:
– Upgraded Appearance Design: Features a protective bar against collision/interference.
– Improved Transmission Cooling Efficiency: Ensures 100% oil flow through the cooler.
– Complete Package Contents: Includes the bypass, O-rings, and clips.

Pros:
– Unique protective feature for enhanced component longevity.
– Wear-resistant and high-temperature-resistant aluminum alloy construction.
– Ideal for maintaining reliable operation in varied climates.

Cons:
– The protective bar design might slightly complicate initial positioning during install.

Best for: Users who want maximum cooling benefits combined with physical protection against accidental damage in the engine bay.

Expert Opinion: The integrated protective bar is a feature we haven’t seen on many other units. It shows a commitment to long-term physical integrity alongside thermal efficiency, making this a reliable contender for the best 68rfe thermal bypass valve.

Transmission Cooler Thermostatic Bypass Valve Upgrade Fit for 2013 2014 2015 2016 2017 2018 Dodge 68RFE Ram 6.7L Cummins 2500 & 3500 Diesel (Black 2013-2018)

Crafted from high-quality billet 6061 aluminum, this bypass upgrade is precision-designed to eliminate the restrictive orifice found in the factory TBV. By removing this flow restriction, it helps maintain much lower transmission operating temperatures under stress. Its sturdy, impact-resistant structure and corrosion resistance ensure long-term reliability. Like many great options, this unit comes with a one-year warranty and commitment to customer service.

Key features that stand out:
– Billet 6061 Aluminum Material: High-quality, durable construction.
– Eliminates Orifice Restriction: Ensures maximum cooler flow.
– Precision Design: Guarantees proper fitment and reliable performance.

Pros:
– Strong, resilient material choice (Billet 6061 aluminum).
– Direct fitment for 2013-2018 68RFE models.
– Excellent customer service commitment.

Cons:
– Lacks integrated cooling fins present on some competitors.

Best for: Those seeking a robust, reliable billet aluminum solution for the 2013–2018 model years without unnecessary complexity or added features.

Expert Opinion: You can’t go wrong with billet 6061 construction when dealing with critical fluid components. This is a robust, no-nonsense option focused purely on maximizing fluid movement.

Aosuracing 68RFE / AS69RC Transmission Thermal Bypass Valve Upgrade with Billet Filter Coupler Compatible with 2019-2024 Ram 6.7L Cummins Diesel

Aosuracing offers a strong option for the newer 2019-2024 68RFE and AS69RC transmissions. This unit not only eliminates the risk of bypass valve failure but guarantees 100% cooler flow, which is crucial for reducing temperatures and extending transmission life. CNC machined from 6061 aluminum alloy, it features integral aluminum cooling fins to aid in passive heat management. Crucially, this kit includes the necessary billet filter coupler and installation instructions.

Key features that stand out:
– Integrated Cooling Fins: Aids in passive cooling of the housing.
– 2019-2024 Compatibility: Designed for the latest Ram transmission setups.
– Includes Billet Filter Coupler: Provides comprehensive upgrade value.

Pros:
– Combines cooling efficiency with enhanced filtration components.
– CNC machined 6061 aluminum ensures high precision.
– Simple installation with included instructions.

Cons:
– Less widespread brand recognition compared to ATS or Revmax.

Best for: Owners of 2019+ trucks looking for a complete kit that addresses both thermal regulation and filtration housing durability.

Expert Opinion: Pairing the thermal bypass upgrade with a billet filter coupler is smart engineering, offering total protection for the cooling and filtration circuits in the newer 68RFE platform.

Comparison Short Insights

When evaluating which unit is the best 68rfe thermal bypass valve for your truck, the model year compatibility is the single most important factor. The 2013–2018 and 2019+ trucks utilize different componentry, making specific fitment essential.

For 2013–2018 models, the Revmax ZeroStat and its variations stand out for their focus on simplifying the flushing procedure—a huge benefit for routine maintenance. If you prioritize maximum flow assurance, the Revmax claiming an 87% flow increase is a compelling statistic.

If you own a 2019–2024 truck, your options are more limited but highly targeted. Both the Aosuracing and the dedicated upgrade from [Product 7] offer the necessary billet filter coupler alongside the bypass, providing a critical dual upgrade for the newer chassis.

Finally, consider the added value components. Products from ATS Diesel, Aosuracing, and the 2019+ specific kits that include the billet filter coupler often represent the best overall long-term investment in transmission health beyond just the thermal bypass function.

Final Verdict: Determining the Top Thermal Bypass Upgrade

Choosing the best 68rfe thermal bypass valve comes down to your truck’s specific year and your primary use case.

If you own a 2013–2018 truck and value DIY maintenance ease: The Revmax ZeroStat technology is the clear winner. Its ability to facilitate cold fluid flushing saves significant time and equipment costs.

If you own a 2019–2024 truck and seek a complete system upgrade: The Aosuracing 68RFE / AS69RC Transmission Thermal Bypass Valve Upgrade with Billet Filter Coupler offers the ideal pairing of thermal correction and filtration durability specifically engineered for the newer model years.

If budget is less of a concern and maximum component quality is essential: The ATS Diesel – 68RFE / AS69RC Thermal Bypass Valve Up-Grade provides the highest level of brand confidence and component integration, offering a highly reliable, premium solution across multiple year ranges (depending on the specific part number).

Frequently Asked Questions About Best 68RFE Thermal Bypass Valve

Why do I need to upgrade the factory 68RFE thermal bypass valve?

The factory thermal bypass valve (TBV) is thermostatically controlled, meaning it restricts or completely bypasses flow to the external cooler until the transmission fluid reaches a very high operating temperature (often around 180°F to 200°F). While this aids in faster warm-up, it severely restricts cooling when the transmission is under load. An upgraded bypass valve ensures maximum cooling efficiency right from startup, significantly lowering peak transmission temperatures and promoting 68RFE longevity.

Does a TBV upgrade affect my transmission’s warm-up time?

Yes, a TBV upgrade will generally increase the time it takes for your transmission fluid to reach its normal operating temperature since fluid is routed to the cooler immediately. However, most modern transmission systems can handle this minor delay, and the long-term benefit of reduced heat buildup during heavy towing or performance driving far outweighs the slightly slower warm-up.

Is the installation of a best 68rfe thermal bypass valve difficult?

For most mechanically inclined owners, installation is straightforward. It usually involves removing the stock TBV assembly, which is located near the transmission pan or on the transmission side of the cooling lines, and bolting the new billet aluminum bypass in place. Most kits are a direct bolt-in replacement and require basic hand tools. Be prepared for some fluid loss during the process.

What is the advantage of a billet aluminum bypass design over OEM?

The OEM thermal bypass valve uses internal components that are prone to sticking, failing, or restricting flow even when fully “open.” Upgraded designs, often made from CNC machined billet 6061 aluminum, remove the restrictive thermal elements entirely, guaranteeing unrestricted flow and offering superior durability, corrosion resistance, and often include integrated cooling fins.

Do I need a different thermal bypass valve for 2019-plus model years?

Yes, absolutely. The chassis and transmission cooling systems underwent significant changes starting around the 2019 model year. If you have a 2019–2024 Ram 6.7L Cummins with the 68RFE, you must purchase a thermal bypass valve specifically designed for that updated platform. Attempting to use a 2013–2018 bypass may result in improper fitment or inadequate cooling line connections.

How does this upgrade help with transmission fluid flushing?

A major benefit of the aftermarket TBV is the ability to flush the cooler lines without specialty equipment. Since the factory valve remains closed until the fluid is hot, traditionally you needed an expensive “hot flush machine” to get the thermostat to open. Upgraded zero-stat designs eliminate this restriction, allowing you to use room-temperature fluid for effective routine transmission fluid servicing.