Ram 68RFE Buyer's Guide: Years, Weak Points, What to Verify

"It's a Ram Cummins, so it's a 68RFE." Usually. But the 2500 or 3500 in your driveway might carry a different transmission, and a wrong guess means the wrong unit on your shop's lift.

Chrysler's 68RFE is the six-speed behind the 6.7L Cummins in Ram 2500 and 3500 pickups, from the 2007 model year on. Through 2019–2024 the standard-output engine, rated at 850 lb-ft, still pairs with it. The high-output 3500 pickup doesn't. Those trucks got an Aisin AS69RC. The 2025 high-output engine moved on to a ZF eight-speed.

So the first question isn't "which 68RFE." It's whether your truck has one at all. Check the engine badge and the build sheet before you check anything else.

They share a family name and a lot of habits, which is why parts catalogs lump them together. They aren't the same transmission.

The 545RFE is a five-speed, and its first gear is 3.00:1. The 68RFE has its own gearset with a 3.23:1 first, a bigger bellhousing and parts strengthened for diesel torque. The 66RFE, a gas-engine 2500/3500 unit from 2012–2018, blends the two: 68RFE internals in a 545RFE-style case. A listing that says "RFE" without the number tells you almost nothing. And most gas-engine 2500s from 2012–2018 are 66RFE trucks, so a diesel-transmission quote for one is a red flag.

In 2019 the 68RFE in 2500-series diesel trucks was reworked. The pump, valve body and solenoid pack all changed, and the valve body gained a lower section with a separate torque converter clutch solenoid and a reverse accumulator. The easy tell is the solenoid pack connector: gray before, blue after.

Pre-2019 and 2019-and-later parts don't swap. Mixing them gets you slipping, a missing reverse, or a bind-up in Drive. Tell us your model year and we'll match the unit to it.

Two complaints show up again and again.

**The overdrive clutch.** Heat distorts the pack, it stops releasing cleanly, and it burns. Tuned trucks make it worse.

**Converter lockup shudder.** It feels like driving over a rumble strip, usually somewhere between 35 and 55 mph, with RPM flare when the converter should be locked. Burnt fluid often rides along.

1. **Give us the VIN and model year.** Not "2500 Cummins." The 2019 split alone makes that too vague. 2. **Tell us about the engine.** A tuner, a heavy fifth-wheel, a plow? Say so. 3. **Plan for the cooler.** The shop machine-flushes and flow-tests it, or replaces it, at installation. Expedia Protection wants the invoice to show which. 4. **Put the fluid on the invoice.** Use the type and quantity your manual specifies, and have the shop write it down. 5. **Ask whether your truck needs the control module reprogrammed.** Where it does, that step goes on the invoice too. 6. **Don't pull the old unit until you have a written pre-authorization number** for any warranty concern.

A diesel truck shows a plugged cooler sooner than most, so don't skip step 3. The break-in advice in [our first-500-miles guide](/blog/transmission-break-in-first-500-miles) applies in full, and [this comparison](/blog/reman-vs-used-engines-transmissions-how-to-choose) covers when a used unit still makes sense.

One thing we can't settle from a listing: whether the last owner ran a tune. If you know, tell us.

• Warranty policy and Expedia Protection: /warranty
• Pre-authorization before removing the unit: /blog/pre-authorization-before-removing-unit
• When your transmission needs a reflash: /blog/when-transmission-needs-reflash
• Transmission slip and shudder after replacement: /blog/transmission-slip-and-shudder-after-replacement
• Torque converter shudder vs bad transmission: /blog/torque-converter-shudder-vs-bad-transmission
• Valve body issue or software issue: /blog/valve-body-issue-or-software-issue