68RFE Ram 3500 Cummins Fluid Change: Type, Capacity and Cost

A Ram 3500 with the 6.7L Cummins gets bought to pull a fifth wheel or a gooseneck, and that changes what a fluid service on the 68RFE is supposed to accomplish. On a 3500 the job is not "replace the old ATF." It is: confirm the truck actually has a 68RFE and not the Aisin, deal with a dipstick that on some trucks you are not allowed to read, get both filters and the level right, and find out whether the cooling side is cooking the fluid faster than any interval can keep up with.

This post covers the 3500 pickup specifically. The wrenching itself is the same as on the 2500, and we walked through it step by step in the 68RFE Ram 2500 Cummins fluid change post. Here I focus on what is different on the one-ton, with every number traced to Ram owner information, FCA bulletins and recall instructions on file with NHTSA, or ATRA's GEARS magazine. Sources are at the bottom.

Recommended 68RFE parts

For a 68RFE service on a towing 3500: the filter kit with both filters and the pan gasket, a deep aluminum pan with filters for more fluid and a drain plug, and the thermal bypass valve for 2019-2024 trucks that run hot. Secure checkout.

Doc's Diesel 68RFE Transmission Filter and Pan Gasket Kit for 6.7L Cummins Ram 2500 / 3500 4WD (Replaces 5013470AC)

$92.99View part

68RFE Aluminum Deep Transmission Pan with Filter Kit

$287.99View part

68RFE Thermal Bypass Valve Kit, 2019-2024 Ram 6.7 Cummins

$111.99View part

Step Zero on a 3500: 68RFE or Aisin AS69RC?

This matters more on a 3500 than on any other Ram, because the 3500 is where Ram put both six-speed automatics. Ram's 2017 Diesel Supplement says it plainly: Chassis Cab models with an automatic use the AS69RC, and "Pickup models may use either the AS69RC transmission, or the 68RFE transmission." The two take different fluid. The same document specifies ATF+4 for the 68RFE in 2500/3500 pickups without PTO, and "Only use Mopar ASRC Automatic Transmission Fluid or equivalent" for the AS69RC.

The quick physical tell is in that same supplement: the AS69RC "is equipped with a Power Take-Off [PTO] access cover on the side of the transmission case," and the 68RFE "has no PTO access cover." Crawl under with a light before you buy fluid. On the build sheet, the 68RFE is sales code DG7, which is how FCA's own bulletins identify it. If you find that PTO cover, the truck has the Aisin and this procedure does not apply; our 68RFE vs Aisin AS69RC comparison covers the rest of the differences.

What the Fluid and Parts Actually Are

FCA's most recent parts list for 68RFE work on 2024 Ram 2500/3500 Cummins trucks, in TSB 21-054-24, names the pieces that touch a pan service. The fluid is ATF+4 quarts, part 68218057AC, to Standard MS 9602-F. The pan gasket is 68425659AA. The 15 pan bolts are 06102403AA, M6x1x14 flange-head. The sump filter seal is 04799964AD. Check those numbers against what is in your kit box.

For a pan-and-filter service, FCA's Recall W03 instructions list 6 quarts of ATF+4 as required and refill with approximately 5 quarts before setting the level hot. Buy 7; a deep aftermarket pan needs the extra.

The 68RFE has two filters: the sump filter that plugs into the pump inlet with a seal, and a spin-on cooler return filter. Both get replaced every time. Start the spin-on filter by hand; its plastic nipple cross-threads easily.

Pan Drop, Seal and Torque

FCA's W03 procedure is the reference: clean the pan rail, loosen all 15 fasteners so the pan drops slightly and drains, then remove it. Clean the pan and its 3 magnets with mineral spirits, and let it dry completely. With a new gasket, the 15 bolts go to 9 N·m (80 in-lb) in a crisscross pattern. These thread into the aluminum case, so use an inch-pound torque wrench. A long ratchet will strip one before you feel it.

Bronze flake, aluminum glitter or friction material on the magnets means the truck needs a diagnosis, not a service. On a 2024 truck, also keep TSB 21-054-24 in mind. It covers a cracked rear selective thrust plate in 2024 Ram 2500/3500 68RFE units, with codes including P0218 (high temperature operation), P0731 through P0735 and P0729 (incorrect gear ratios), P0868 (fluid pressure low) and P0944 (loss of hydraulic pump prime), plus hard shifts and limp mode. If your 2024 3500 has any of those codes, a fluid change is not the repair. Get the VIN checked against the bulletin. The repair is a 4.0 hour thrust plate replacement, and its parts list calls for 18 quarts of ATF+4 because the converter comes out.

The 3500 Dipstick Problem: Recall ZA3

Here is the detail that catches 3500 owners doing their own service. FCA Safety Recall ZA3 (NHTSA 22V-835, December 2022) covers 2020-2022 Ram 3500 pickups and 2020-2023 Ram 2500 pickups with the 6.7L and the 68RFE, about 248,800 trucks. The defect: a buildup of pressure and heat inside the transmission "can result in transmission fluid being expelled from the dipstick tube," where it can reach ignition sources in the engine compartment and start a fire.

The remedy replaces the original non-locking 44-inch dipstick with a 15-inch locking dipstick (part 68634254AB) and installs a redesigned transmission vent tube (68637438AA) secured to the harness with two zip ties whose tails are left on. The 15-inch stick is a plug, not a gauge. The recall notes it "is marked with a warning against using it to check fluid level." Dealers are told to keep one of the old 44-inch sticks tagged as a service tool for reading level on recalled trucks.

Ram's 2022 2500/3500 owner's manual repeats the rule: only the 44-inch dipstick with level-indicator holes can be used for the check, and trucks with the 15-inch dipstick need a service dipstick. So before you drain anything on a 2020-2022 3500, pull the stick and look. If it is the short locking one, you need a 44-inch 68RFE service dipstick in hand to set the level, or you need to let a dealer do the final check. Do not guess the fill by quarts, and do not reinstall a 44-inch stick permanently in a recalled truck. That stick is exactly what the recall removed.

If the truck is a 2019-2020, also run the VIN for Recall W03 (NHTSA 20V-043), which fixed the same fluid-out-the-tube problem on the valve body side with a new lower separator plate and a PCM reflash. A truck with either recall still open should go to the dealer before you service it.

Setting the Level Hot

With the right dipstick in hand, the procedure in Ram's 2022 owner's manual is the one to follow:

1. Bring the fluid to 158-176 F (70-80 C), which the manual says usually takes at least 15 miles of driving. The 2017 Diesel Supplement lists 170-180 F for the 68RFE specifically, so I set it with the scan tool or cluster reading 170-176 F, which satisfies both documents.
2. Park level, idle at least 60 seconds, set the parking brake, hold the brake pedal, and move through each gear, ending in PARK.
3. Wipe the stick, reseat it fully, pull it and read both sides. A reading only counts if both sides have a solid coat of oil.
4. The level belongs between the upper HOT holes. If low, add ATF+4 through the tube a little at a time, and wait at least two minutes before rechecking. "Do not overfill."

The cold range, between the lower COLD holes at 60-70 F, is only a rough reference right after a service. Below 50 F the fluid may not register at all, so do not add fluid to a cold truck because the stick looks dry. After a pan drop I fill about 5 quarts, start it, check the cold range, then drive it and set the final level hot.

Overfilling is not a cosmetic mistake on these trucks. Both recalls above exist because fluid found its way out the dipstick tube. An overfilled pan churns and aerates the fluid, it heats up, and the tube is where it goes.

Interval: Assume Your 3500 Is Severe Service

Ram's diesel maintenance schedule in the 2017 Diesel Supplement lists 68RFE fluid and filter changes at 120,000 miles for normal use, and at 60,000 and 120,000 miles for "police, fleet, or frequent trailer towing (68RFE transmission only)." Nobody buys a 3500 Cummins to not tow. Treat 60,000 as the factory ceiling, not the target.

What really sets the interval is heat. ATRA's GEARS magazine, in Mike Brown's article on 48RE, 68RFE and AS68RC overheating, puts the ideal maximum transmission temperature at 200 F and says each 20 degrees above that cuts expected life by a factor of two: half the life at 220 F, a quarter at 240 F, an eighth at 260 F. On my bench, a 3500 that tows regularly gets pan and both filters every 30,000 to 40,000 miles, and sooner if the scan tool shows it living above 200 F on pulls. That is shop practice, not a factory number.

If It Runs Hot, Fluid Is Not the Fix

The GEARS article's example truck was a 2008 Dodge 6.7 R3500 that overheated the transmission while towing, and the diagnosis is a good checklist for any 3500:

• Check the tow rating first. The customer in that case believed the truck was rated for 14,000 lb. The owner's manual said 11,000. A one-ton over its rating will overheat a healthy transmission.
• Flow-test the cooler. Flow should be at least a gallon per minute. Inspect the lines for kinks, dents and crush marks, and check the internal and external filters.
• Test the electronic viscous fan drive. The article describes trucks where engine temperature is normal but the transmission overheats because the fan runs, just not to spec. The test: engine warm, A/C off, scan tool on, run at 2000 RPM until fan speed reaches 1850 RPM or more for 30 seconds. That can take up to 15 minutes.
• Suspect the thermostatic bypass valve last. It should be wide open in hot weather. If it is stuck open, a flush machine will not clean the cooler at all. On that 2008 truck, the article says the only fix was replacing the cooler, and it warns against blocking the system to force flow through the cooler because that can cause drain-back problems.

On 2013-and-later trucks the bypass valve is serviced on its own, and replacement valve kits are sold for both the 2013-2018 and 2019-on cooler circuits. If your scan data says the trans is hot and the fan and flow check out, that valve is the next thing to replace, before you pour another six quarts of ATF+4 into a system that will cook it. More on that circuit in our 68RFE cooler line post.

What It Costs on a 3500

The DIY version is parts only: a filter kit with both filters and the pan gasket (ours runs $92.99), plus 6 to 7 quarts of licensed ATF+4. Add a 44-inch service dipstick if your truck has had Recall ZA3 and you do not have access to one. A complete kit with 10 quarts of ATF+4 and filters is $287.99 if you want everything in one box. A deep aluminum pan is a one-time upgrade worth considering on a hard-towing 3500: more fluid, more time for it to shed heat, and a drain plug for the next service.

For a shop service, there is no flat-rate number worth quoting because it varies so much by market. What matters is what the quote includes. It should name ATF+4 by spec (MS-9602), both the sump and spin-on filters, a new pan gasket, a hot level check with a proper dipstick, and a recall check by VIN. It should not include a chemical flush. Ram's 2017 Diesel Supplement says "No chemical flushes should be used in any transmission," and damage from them is not covered by the New Vehicle Limited Warranty. A quote with a can of flush in it is a reason to go somewhere else. The full parts-and-labor breakdown is in our 68RFE fluid change cost post.

After the Service

Drive it 10 to 20 miles with several full upshift sequences, recheck the level hot, and look under the pan with the engine running. If it shifts worse, slips or sets codes after fresh fluid, the service did not cause the problem, it uncovered it. Start with our 68RFE Ram 3500 Cummins slipping guide and the 3500 common problems rundown.

For OEM fluid specs across Ram, GM and Ford trucks, keep our transmission fluid spec chart handy.

FAQ

What transmission fluid does a Ram 3500 Cummins take?

It depends on the transmission. Ram's diesel owner information specifies ATF+4 for the 68RFE in 2500/3500 pickups and Mopar ASRC for the Aisin AS69RC, which 3500 pickups can also have and all chassis cabs use. The AS69RC has a PTO access cover on the side of the case; the 68RFE does not.

How many quarts does a 68RFE take for a fluid change on a 3500?

Plan on about 5 to 6 quarts for a pan and filter service. FCA's Recall W03 procedure lists 6 quarts of ATF+4 required and refills approximately 5 quarts before setting the level hot. Buy 7 if the truck has a deep aftermarket pan.

Why can't I check the transmission fluid on my 2020-2022 Ram 3500?

Recall ZA3 (NHTSA 22V-835) replaced the original 44-inch dipstick with a 15-inch locking dipstick that is marked not to be used for checking level. Ram's owner's manual says only the 44-inch dipstick with level holes can be used, so you need a 68RFE service dipstick or a dealer to set the level.

How often should the 68RFE fluid be changed on a 3500 that tows?

Ram's diesel maintenance schedule calls for 68RFE fluid and filters at 60,000 miles for frequent trailer towing versus 120,000 for normal use. Heat sets the real interval: ATRA's GEARS magazine says each 20 F above 200 F halves expected transmission life, so a hard-towing 3500 should be serviced well before 60,000.