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Call or Text (352) 722-5295Transmission lines on the 2010-2018 RAM 6.7L Cummins
Standard-output 6.7L Cummins trucks in this generation use the Chrysler 68RFE six-speed automatic, filled with Mopar ATF+4. The lines carry that fluid out to the cooling circuit and back. From 2013, 3500s with the High Output engine use the Aisin AS69RC, which runs Mopar ASRC fluid on a 30,000-mile schedule, and manual trucks use the G56 six-speed. The line and bypass kits on this page are for 68RFE trucks.
Why the 68RFE deserves attention
The 68RFE has a track record worth knowing. Failures were especially common on 2007-2011 trucks and typically land somewhere between 50,000 and 150,000 miles. Watch for slipping in 4th through 6th, harsh or flared shifts, limp mode and metal in the pan. Its known wear parts are the separator plate, accumulators, solenoid pack, valve body, overdrive clutches and converter. Fluid upkeep is the easy part of owning one: Mopar ATF+4 and a new filter every 60,000 miles in severe service, or 120,000 miles in normal service. Any time you open the lines, top the fluid back up with ATF+4.
Stock replacement vs. upgrade
The Fleece FPE-TL-CUMM-1012 is a 68RFE replacement transmission line kit, made to take the place of the factory lines. The Mishimoto MMTC-RAM-10LK is a transmission cooler bypass kit. The Fleece kit replaces the lines themselves; the Mishimoto kit works on the cooler bypass side of the circuit. Read each listing for exactly which factory parts it replaces and what hardware is included, then pick the one that matches the part of the circuit you are repairing.
What we carry
- Fleece Performance Engineering FPE-TL-CUMM-1012 68RFE replacement transmission line kit, titled for 2010-2012 6.7L Cummins trucks.
- Mishimoto MMTC-RAM-10LK transmission cooler bypass kit, titled for 2010-2012 6.7L Cummins trucks.
Fitment notes
These parts are titled for 2010-2012 6.7L Cummins trucks. If you have a 2013-2018 truck, do not assume they fit; run your VIN through the fitment checker or call. Make sure your truck has the 68RFE: its dipstick is on the passenger side, while the Aisin AS69RC in 2013 and later 3500 High Output trucks has its dipstick on the driver side, and Aisin parts never fit a 68RFE truck. Chassis-cab 3500, 4500 and 5500 trucks use different frames than pickups, so verify chassis-cab fitment separately.
Frequently asked questions
Will these transmission line parts fit my 2016 Ram 2500?
They are titled for 2010-2012 trucks only. A 2013-2018 truck needs parts listed for its own years, so use the fitment checker or call the shop with your VIN before ordering.
What fluid do I top off with after replacing 68RFE lines?
Mopar ATF+4 for the 68RFE. If your truck turns out to be a 3500 High Output with the Aisin AS69RC, it takes Mopar ASRC instead, never ATF+4.
How can I tell which automatic my truck has?
Look at the dipstick. Passenger side means the 68RFE; driver side means the Aisin AS69RC. Aisin pickups also wear the HO badge; in pickups, the Aisin came only with the 3500 High Output engine from 2013.
Not sure what fits? Call the shop at the number in the header, or use the fitment checker on any product page. We install everything we sell.