Common Problems and Solutions for the Aisin AS69RC Transmission

The Aisin AS69RC is one of the toughest heavy-duty transmissions available in modern Ram trucks, designed to handle extreme torque and heavy towing. You’ll find this transmission most commonly in 2013–2018 Ram 3500, 4500, and 5500 models equipped with the 6.7L Cummins diesel engine. These trucks are built for work—towing, hauling, and commercial duty—which means their transmissions live some of the hardest lives on the road. The AS69RC was engineered for strength, but like any piece of equipment, it has its weak points. At Monster Transmission, we’ve rebuilt and upgraded countless AS69RC units, and we know exactly where they fail and how to fix them.

In this blog, we’ll dive into the most common issues owners face with the AS69RC, the real-world symptoms you might see, and the proven solutions Monster builds into our StreetMonster Dodge Aisin AS69RC Transmission & Torque Converter. We’ll also touch on how the AS69RC compares to the 68RFE transmission, since many Ram owners often ask which one is the better fit for their needs.

Where You’ll Find the Aisin AS69RC

The AS69RC isn’t found in every Ram—only the big boys. Specifically, it’s installed in:

  • 2013–2018 Ram 3500 with the 6.7L Cummins (high-output models)
  • 2013–2018 Ram 4500 Chassis Cab
  • 2013–2018 Ram 5500 Chassis Cab

Ram chose this Aisin transmission for its ability to handle high torque loads, especially in commercial and towing applications. If you’ve got a Ram in this range with an Aisin, you’ve got a serious work truck—but you also need to be aware of the common pitfalls. Learn more about Cummins pairings directly from Cummins official resources.

Problem #1: Clutch Tooth Wear on the K2 Hub

One of the most notorious issues with the AS69RC is accelerated wear on the K2 clutch hub teeth. Over time, the OEM hub design begins to round off and fail, leading to slipping, harsh shifting, and eventually complete loss of drive. Many drivers notice delayed engagement or odd gear changes long before the unit gives up entirely.

Monster’s Solution: Our StreetMonster AS69RC features a billet nitride-coated K2 hub. The hardened surface drastically improves durability and prevents premature wear. This upgrade alone solves one of the most common failure points in the AS69RC.

Problem #2: Weak Line Pressure and Clutch Holding

From the factory, the AS69RC can suffer from low line pressure during heavy towing or acceleration. This means the clutches don’t fully apply, leading to slipping, heat, and shortened life. It’s one of the reasons many AS69RC trucks start to feel “lazy” under load.

Monster’s Solution: We upgrade the valve body to increase line pressure and ensure strong clutch apply. Combined with custom-selected frictions, our build maintains OEM shift quality but dramatically improves holding power where it matters most. Proper fluid and cooler maintenance also play a big role—learn why in our blog on flushing cooler lines when replacing a transmission.

Problem #3: Leaks from OEM Gaskets

AS69RC transmissions are notorious for developing leaks at the pan and PTO covers due to cork gaskets that can’t handle heat and pressure cycles. Nothing kills confidence faster than a fresh build leaving spots on the driveway.

Monster’s Solution: We replace the cork with nitrile pan and PTO gaskets. These gaskets resist heat and compression, preventing leaks and keeping fluid where it belongs. Always use approved Mopar transmission fluids and gaskets to protect your investment.

Problem #4: Torque Converter Issues

Stock AS69RC torque converters often fail due to weak clutch packs and sprag issues. Symptoms include shuddering during lockup, poor efficiency, and early wear when towing heavy loads.

Monster’s Solution: Our remanufactured torque converter includes brand-new clutches (3 frictions and 3 steels), a new sprag for reliable stator operation, and stronger internals for long-term durability under heavy torque.

Other Upgrades in the StreetMonster AS69RC

  • Maintains OEM clutch counts while improving durability
  • Custom-selected friction materials for precise shift quality
  • Upgraded internals where the AS69RC typically fails—no gimmicks
  • Dyno-tested and backed by a 5-year unlimited mile warranty (2-Year Monster + 3-Year Extend)

AS69RC vs. 68RFE: How to Tell the Difference

One of the most common questions we get from Ram owners is: “Do I have the Aisin AS69RC or the 68RFE?” Since Ram 3500 trucks were offered with both, it’s easy to get confused. Here’s the quick breakdown:

  • 68RFE: Found in most Ram 2500s and many Ram 3500s. It’s the more common transmission, less expensive to service, and has a wide range of aftermarket tuning support. For light-to-medium duty towing, it usually gets the job done. Read more in our 68RFE problem guide.
  • AS69RC: Reserved for Ram 3500s with the high-output 6.7L Cummins, and standard in Ram 4500 and 5500 trucks. It’s heavier, stronger, and built for commercial-duty use. From the factory, it has higher torque capacity but also comes with higher service costs and fewer tuning options.

If you’re unsure which transmission is in your truck, check your build sheet or VIN data, or look at the transmission pan—each has a distinct shape. Knowing which unit you have is critical for choosing the right parts, upgrades, and maintenance plan. For a detailed head-to-head comparison, see our blog: Aisin AS69RC vs. 68RFE: Which Transmission Do You Have?

Installation and Specs

  • Fluid Capacity: 14 quarts of Mopar ASRC fluid
  • Install Time: Approximately 8 hours
  • Warranty: 5-Year Unlimited Miles (2-Year Monster + 3-Year Extend)
  • PTO Provision: 2WD models come with a right-hand side PTO; left-hand side is special order from the factory. Confirm before ordering.
  • OEM Part # Replacements: (2WD) 68300149AB, R8300149AB | (4WD) 68300150AB, R8300150AB

FAQ: Aisin AS69RC Transmission

Q: What trucks use the AS69RC?
A: 2013–2018 Ram 3500, 4500, and 5500 trucks with the 6.7L Cummins high-output option.

Q: Can the AS69RC handle power upgrades?
A: Yes, but only with proper upgrades. Our billet hub, valve body, and converter improvements make it much more reliable under added stress.

Q: How much fluid does it take?
A: The AS69RC uses about 14 quarts of Mopar ASRC fluid. Always use the correct spec fluid for best results.

Q: How long does installation take?
A: Roughly 8 hours, depending on shop experience. Trucks with PTO provisions may require additional checks.

Bottom Line

The Aisin AS69RC is a stout transmission built for the toughest jobs, but it’s not without flaws. From clutch tooth wear to weak converters and leaky gaskets, the factory design leaves room for improvement. At Monster Transmission, we’ve tackled these issues head-on with billet upgrades, precision valve body work, and torque converter reinforcements.

If you’re ready to eliminate the common problems of the AS69RC, check out the StreetMonster Dodge Aisin AS69RC Transmission & Torque Converter. It’s stronger, smarter, and backed by a 5-year unlimited mile warranty. Call us at (800) 708-0087 or visit monstertransmission.com to learn more.

At Monster, we build more than transmissions—we build relationships. Solving the AS69RC’s problems is just one more way we keep you moving with confidence.