The 68RFE and the Aisin AS69RC are the six-speed automatics Ram pairs with the 6.7L Cummins in its heavy duty pickups. The 68RFE is Chrysler’s own transmission and is used behind the standard-output 6.7L in 2500 and 3500 pickups, while the Aisin is a larger, heavier-duty unit built by Aisin that Ram offers with the high-output Cummins in 3500 pickups from 2013 on and in chassis cab trucks. The Aisin is intended for higher torque; the 68RFE is the more compact of the two.
68RFE overview
The 68RFE arrived with the 6.7L Cummins for the 2007.5 model year. It belongs to Chrysler’s RFE family of electronically controlled automatics, with a lockup torque converter and overdrive top gears for lower highway rpm. It has been used across a long run of Ram 2500 and 3500 pickups, which makes it the transmission most 6.7L Cummins owners have.
Aisin AS69RC overview
The AS69RC is a heavy-duty six-speed automatic made by Aisin, a major Japanese transmission supplier. Ram fits it to 3500 pickups ordered with the high-output 6.7L Cummins from the 2013 model year, and Aisin automatics have also been used in Ram chassis cab trucks. It is physically larger and heavier than the 68RFE and is built for the higher torque of the high-output engine.
68RFE vs Aisin at a glance
| Factor | 68RFE | Aisin AS69RC |
|---|---|---|
| Built by | Chrysler (in-house) | Aisin |
| Typical application | Ram 2500 and 3500 with the standard-output 6.7L Cummins | Ram 3500 with the high-output 6.7L Cummins (2013 on); chassis cab trucks |
| Speeds | Six, with overdrive | Six, with overdrive |
| Size | More compact and lighter | Larger and heavier |
| Design focus | Standard-output torque | High-output torque |
The two transmissions also use different specified fluids. Always use the fluid listed in your owner’s manual for the transmission your truck actually has.
How to tell which transmission your truck has
The quickest way to confirm is the truck’s original window sticker or build sheet, which lists the transmission option. The identification tag on the transmission case is another source, and knowing whether your truck has the standard-output or high-output engine narrows it down. Our guide on how to identify your transmission walks through the general process. If you are still unsure, send us your VIN before ordering.
Can you swap a 68RFE for an Aisin?
Generally not as a bolt-in job. The two transmissions differ in size and mounting, and a swap typically involves different crossmember and driveshaft arrangements, wiring and vehicle programming. For most owners, the practical path is replacing the transmission with the same type the truck was built with.
Before you replace either transmission
Slipping, harsh shifts and shudder can come from fluid, torque converter or control problems as well as internal wear, so get a proper diagnosis first. Our guide to transmission slipping signs and causes covers what to look for.
Replacement 68RFE and Aisin transmissions
We carry several 68RFE units with torque converters, including the RoadReady 68RFE, plus the StreetMonster Aisin AS69RC with torque converter for trucks built with the Aisin. Each listing explains what is included; if you tow heavily, tell a specialist about your truck and loads before you choose.
Compare every option on our 68RFE transmissions page.
More guides: 68RFE problems · 48RE vs 68RFE · 68RFE vs Allison 1000 · how long a 68RFE lasts.
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