68RFE Ram 2500 Cummins Fluid Change: Type, Capacity and Cost

The 68RFE fluid service on a Ram 2500 with the 6.7L Cummins looks like a Saturday driveway job, and mechanically it is. Fifteen pan bolts, two filters, a few quarts of ATF+4. What makes it go wrong is not the wrenching. It is the four details nobody prints on the jug: there are two filters and one of them hides, the level has to be set hot and not by the quart, the pan bolts thread into soft aluminum, and an overfilled 68RFE will push fluid out the dipstick tube onto a hot turbo. FCA wrote a safety recall around that last one.

This is the procedure for a 2007.5-and-later Ram 2500 Cummins, with every number traced to a Ram owner's manual, an FCA bulletin or FCA recall instructions filed with NHTSA. If you only need the fluid spec, read our 68RFE fluid type and capacity post. If you want the parts-and-labor math, that is in the 68RFE fluid change cost breakdown. This one is the how. Sources are listed at the bottom.

Recommended 68RFE parts

Everything for a 68RFE service on a Cummins 2500: the 4x4 and 2WD filter kits with the spin-on cooler return filter and pan gasket, or the complete kit with 10 quarts of ATF+4. Secure checkout.

Doc's Diesel 68RFE Transmission Filter and Pan Gasket Kit for 6.7L Cummins Ram 2500 / 3500

$92.99View part

68RFE Transmission Filter Kit for 6.7L Cummins Ram 2WD

$92.99View part

68RFE Transmission Service Kit 10 Qt ATF+4 with Filters

$287.99View part

Confirm It Is Actually a 68RFE

Ram built the 2500 and 3500 Cummins with two different automatics, and they take different fluid. The same chassis fluids table that lists ATF+4 for the 68RFE says the Aisin AS69RC gets "Only use Mopar ASRC Automatic Transmission Fluid or equivalent." Pour ATF+4 into an Aisin, or ASRC into a 68RFE, and you have bought yourself a shift-quality problem you cannot flush away cheaply.

The fast check is the sales code on the window sticker or build data: DG7 is the 68RFE, which is how FCA's recall W03 documents identify it. The 68RFE also has a stamped steel pan with 15 bolts. Still not sure? Our 68RFE identification guide walks through it; decode the VIN before opening a jug.

What You Need on the Bench

• 6 quarts of licensed ATF+4 (MS-9602). Get 7 if this truck has an aftermarket deep pan. The label should name MS-9602 and FCA approval, not just say "suitable for ATF+4 applications."
• A sump filter (Mopar 5013470 series for the 4x4 deep pickup), a spin-on cooler return filter (Mopar 5179267 series), and a pan gasket, or a kit that has all three.
• A 3/8-drive inch-pound torque wrench. This is not optional, and I will explain why below.
• Mineral spirits, lint-free rags, a plastic scraper, a long funnel for the dipstick tube, and an 8-quart drain pan.
• A scan tool that reads transmission temperature. Guessing at "warm" is where most bad fills start.

Step-by-Step: Pan, Filters and Refill

1. Warm it, then let it sit a few minutes

Drive the truck 10 to 15 minutes so the fluid is warm and the debris is in suspension; warm fluid drains faster and carries more fine material out. Then let it sit until you can handle the pan without getting scalded.

2. Loosen all 15 bolts, leave two in

The 68RFE pan has no drain plug from the factory. FCA's own procedure in the W03 recall instructions is the right way to do it: wipe the pan rail clean first so dirt does not fall in, position the drain pan, "loosen all 15 fasteners to allow the transmission pan to slightly separate from the transmission," and leave one bolt in on each side while the fluid runs out the gap. Then hold the pan and pull the last two. Keep it level coming down.

3. Read the pan before you clean it

The pan has three magnets. A light gray paste on them is normal wear from the steels and the gear train. What you do not want to see is bronze glitter (bushings or thrust washers), aluminum flake (pump or case wear), or chunks of black or brown friction material in the bottom of the pan. Any of those means this truck needs a diagnosis, not a service. Take a picture before you wipe anything.

FCA's instruction for the pan is specific: clean the pan and the 3 magnets with mineral spirits, and make sure all the mineral spirits have been "wiped out and allowed to dry before installing the transmission pan." Solvent left in the pan dilutes the new fluid and keeps a gasket or RTV from sealing.

4. Pull the sump filter

The sump filter is held in by its neck, which is pushed into the pump inlet with an O-ring seal. Pull it straight down with a slight twist. Then look up into the bore and make sure the old O-ring came out with the filter. A second O-ring stacked on top of an old one that stayed in the bore is a classic cause of an air leak on the pump suction side, and on a 68RFE that shows up as noise, erratic line pressure and delayed engagement. Lube the new filter's seal with clean ATF+4 and push it home until it seats fully.

5. Replace the spin-on cooler return filter

This is the one that gets skipped. On the 68RFE the cooler return fluid passes through a small spin-on filter before it goes back into the lube circuit, and on Ram trucks that filter sits up inside the pan area with the sump filter, threaded onto a plastic nipple. Spin it off by hand or with a small cap wrench. It will dump fluid when it breaks loose, so have the drain pan right under it.

Two warnings from the bench. First, the factory nipple is plastic and cross-threads easily. Start the new filter by hand, square, and stop the moment it feels gritty. Second, it does not get torqued like an engine oil filter. Lube the gasket, spin it on until the gasket contacts, then snug it per the filter maker's instruction. Overtightening cracks the nipple, and a filter that backs off or a nipple that breaks dumps cooler return flow into the pan instead of the lube circuit. A steel aftermarket nipple is cheap insurance on a truck that tows.

6. Seal and torque the pan

There are two factory numbers for this pan, and both are real:

• FCA TSB 21-024-17 (June 2017) covers a pan leak on 2017 Ram 2500/3500 Cummins trucks with the 68RFE. It specifies Mopar RTV part 05010884AD and pan bolts at 12 N·m (105 in-lb).
• FCA Safety Recall W03 (2020) has the technician install a new pan gasket on trucks over 501 miles or six months from build, and tighten "the 15 fasteners in crisscross pattern to 9N·m (80 in. lbs.)."

If you are installing a gasket, use 80 in-lb in a crisscross pattern. If you are resealing with RTV, 105 in-lb is the documented ceiling. Either way, start all 15 by hand first. These bolts thread straight into the aluminum case, and the pan flange is thin stamped steel. A ratchet and a strong forearm will put 150 in-lb on them without trying, and that is how you get a stripped case hole or a dished flange that never seals again. More detail is in our 68RFE pan bolt torque post.

If you used RTV, give it the cure time on the tube before you put fluid on it.

7. Initial fill

With the truck level and the engine off, add about 5 quarts of ATF+4 through the dipstick tube. That is FCA's own starting number from the W03 procedure, and it is deliberately on the low side. You will finish the fill hot. Do not dump all six in because the case said six.

Setting the Level: Where Most 68RFE Services Fail

Ram's fluid level procedure for the 6-speed in the 2022 owner's manual is precise, and every step in it matters:

1. Get the fluid to normal operating temperature, 158-176 F (70-80 C). FCA's recall instructions put the floor at 160 F to set the level and warn it "may take up to 20 minutes' idle time in Park." Watch transmission temperature on the scan tool rather than guessing.
2. With the truck level, run the engine at idle for at least 60 seconds, then move the shifter through the gears and end in PARK.
3. Pull the dipstick, wipe it, reinsert it fully, and read it. The level should be between the two HOT (upper) reference holes.
4. If it is low, add a small amount, then "wait a minimum of two minutes for the oil to fully drain into the transmission before rechecking." ATF+4 is slow to run down a long tube, and reading it too soon is how people overfill.

One note on the number: Ram's 2017 Diesel Supplement lists 170-180 F (77-82 C) specifically for the 68RFE, a little hotter than the 2022 manual's 158-176 F window. I set the level with the scan tool showing 170-176 F, which satisfies both documents and FCA's 160 F floor.

The 2022 manual adds three details worth knowing. There is a cold range too: between the two COLD (lower) holes at 60-70 F, which is fine for a sanity check but not for setting the final level. Below 50 F (10 C) the fluid "may not register on the dipstick" at all, so do not add fluid to a cold truck because the stick looks dry. And it says plainly: "Do not overfill."

Why overfilling a 68RFE is a fire risk, not just a leak

FCA Safety Recall W03 (NHTSA 20V-043) covered about 85,000 2019-2020 Ram 2500 and 3500 trucks with the 68RFE. The defect: a buildup of pressure and heat inside the transmission "may result in transmission fluid being expelled from the dipstick tube," where it can contact the turbocharger and start a fire. The fix was a new lower valve body separator plate and a PCM reflash. The physics still applies to every 68RFE: the dipstick tube is a vent, the turbo is right there, and an overfilled pan churns, aerates and heats the fluid and gives it somewhere to go. If you own a 2019 or 2020 2500 with the 68RFE, run the VIN on NHTSA's recall lookup before you service it. A truck with W03 still open should go to the dealer first.

Heat Is the Real Interval

Ram's diesel maintenance schedule (the 2017 Diesel Supplement runs it in 7,500-mile columns) lists the 68RFE fluid and filter change at 120,000 miles for normal use, and at 60,000 and 120,000 miles if the truck is used for "police, fleet, or frequent trailer towing (68RFE transmission only)." Read honestly, most Ram 2500 Cummins trucks are severe service. They exist to pull. The same supplement warns that towing up a grade or in stop-and-go traffic in hot weather lets torque converter slip "impose a significant additional heat load on the cooling system."

Heat is what actually sets the clock. ATRA's GEARS magazine, working through 48RE, 68RFE and AS68RC overheating cases, puts the ideal maximum transmission temperature at 200 F and says each 20 degrees above that cuts expected life by a factor of two. The same article says healthy cooler flow should be at least a gallon per minute, and it flags the cooler's thermostatic bypass valve: "If this valve is stuck open, a flush machine will not clean the cooler at all." A truck that runs hot because of a stuck bypass valve will cook new fluid as fast as old fluid. If your scan tool shows the trans running past 200 F on a normal pull, fix the cooling side before you spend money on fluid. Our 68RFE cooler line post covers that circuit.

My shop interval for a 2500 that tows is 30,000 to 40,000 miles for pan and both filters. It is not a factory number. It is what keeps the magnets and the fluid looking right when these trucks come back in.

Pan Drop vs. Getting All the Fluid Out

A pan drop changes only part of the fluid; the rest is in the converter, cooler and lines. To get more of it, either repeat the pan service after 300 to 500 miles, or do a cooler-line exchange after the filters are done, feeding fresh ATF+4 in as fast as old fluid comes out of the return line at idle, with a helper watching the jug. The capacity math is in our 68RFE fluid and capacity post.

What not to do: chemical flushes or additives. Ram's 2017 Diesel Supplement says "No chemical flushes should be used in any transmission," tells you not to add any fluid additives (the only exception is leak-detection dye), and says to avoid transmission sealers because they may adversely affect seals. Chemical-flush damage is not covered by the New Vehicle Limited Warranty. Treat a "transmission flush" quote with a can of cleaner in it as a reason to go somewhere else.

After the Service

Drive it 10 to 20 miles, including a few full upshift sequences, then recheck the level hot and look under the pan with the truck running. A gasket that seals sitting still can weep under load. If it flares, slips or throws a code afterward, the service did not cause the problem, it revealed it. Start with our 68RFE Ram 2500 Cummins slipping guide.

For the full list of OEM fluid types across Ram, GM and Ford trucks, keep our transmission fluid spec chart handy.

FAQ

What fluid does a 68RFE in a Ram 2500 Cummins take?

ATF+4 only. Ram's 2022 owner's manual says "Only use ATF+4 Automatic Transmission Fluid" for the 6.7L diesel with the 68RFE, and FCA's recall parts list calls for ATF+4 to Standard MS-9602-F. The Aisin AS69RC used in some Cummins trucks takes Mopar ASRC instead, so confirm sales code DG7 before you pour.

How many quarts does a 68RFE take for a pan and filter change?

Plan on about 5 to 6 quarts. FCA's W03 recall procedure adds approximately 5 quarts of ATF+4 after a pan drop and lists 6 quarts as required. The final amount is set on the dipstick with the fluid hot, between the HOT reference holes.

How many filters does a 68RFE have?

Two. The sump filter plugs into the pump inlet with an O-ring, and a spin-on cooler return filter cleans fluid coming back from the cooler. Replace both every service, and start the spin-on filter by hand because its plastic nipple cross-threads easily.

What is the 68RFE pan bolt torque?

FCA's W03 recall instructions torque the 15 pan bolts to 9 N-m (80 in-lb) in a crisscross pattern with a new gasket. TSB 21-024-17 specifies 12 N-m (105 in-lb) when resealing with Mopar RTV 05010884AD. Do not exceed 105 in-lb; the bolts thread into the aluminum case.

How often should I change the 68RFE fluid on a Ram 2500 that tows?

Ram's diesel maintenance schedule calls for 68RFE fluid and filters at 60,000 miles for frequent trailer towing, police or fleet use, versus 120,000 miles for normal service. If the transmission regularly runs past 200 F, service it sooner and fix the cooling side first.