The Doc's Diesel DF-370 is a filter and pan gasket set for the Aisin AS69RC six-speed behind the high-output 6.7L Cummins. If you are searching because your Ram 3500 is running hot on a grade pull, the shifts have gone lazy, or it is simply time for the filter service, this is the hardware for the job. It replaces Mopar 68224232AA and crosses to 515619 and TF1431.
What the filter does in an AS69RC
The AS69RC feeds its pump through a pan-mounted filter, and every clutch apply, every lockup event and the cooler circuit all run on what that filter lets through. This transmission leans hard on converter lockup while towing, and the lockup clutch and clutch packs shed fine friction material over the miles. That material collects in the filter media. As it loads up, flow to the pump drops, line pressure softens under load and fluid temperature climbs. Heat then breaks down the friction modifiers in the ATF, which makes lockup slip more and generate still more heat. A fresh filter does not fix worn clutches, but it removes one of the easiest links in that chain.
Symptoms that point to a filter service
- Transmission temperature running higher than it used to on the same tow
- Delayed engagement into Drive or Reverse, especially cold
- Soft or slow shifts, or a lockup shudder at light throttle under load
- Pump whine that changes with engine speed
- Dark fluid, or a pan magnet heavy with fuzz at the last service
A truck that suddenly loses first through fourth gear but still has fifth and reverse is a different problem. On 2022-2023 trucks that pattern, often with P0731, matches the K1 snap ring failure covered by Ram bulletin 21-002-23 and NHTSA investigation PE24009. A filter will not fix that.
How to confirm before you buy
Pull codes first and note the fluid temperature on a scan tool during a normal drive. Smell and look at the fluid: dark but not burnt with light fuzz on the magnet is ordinary service wear, while a burnt smell with flakes of friction material means the unit needs more than a filter. Our AS69RC problems and service guide walks through the failure patterns, and the Aisin overheating guide covers cooler and lockup checks for trucks that tow.
Fitment
The DF-370 is listed for RAM 3500, 4500 and 5500 trucks with the 6.7L high-output Cummins and Aisin six-speed, 2013 through 2024. The Mopar 68224232AA filter it replaces is catalogued for the 2013-2024 Ram 3500 and the 2013-2020 Ram 4500 and 5500, so later chassis cabs should be checked before ordering. Standard-output trucks with the 68RFE use a completely different filter. Match the number on your old filter or send us your year and VIN. Earlier 2007-2012 chassis cabs with the AS68RC take the AS68RC filter and gasket kit instead. Browse all Aisin parts in our Aisin transmission collection.
Install notes
- Warm the fluid, then set a wide drain pan under the truck; the pan drop alone releases several gallons.
- Pull the old filter straight off its seal and confirm the old seal came out with it.
- Clean the pan, magnet and both sealing rails. This gasket is a thick rubber-style seal, not stiff cork, so a little gasket tack or a few loose zip ties keep it in place while you lift the pan.
- Start every bolt by hand, then torque in a cross pattern to spec. Over-tightening squeezes a rubber gasket out of the rail.
- Refill with Mopar AS-RC fluid or an approved JWS 3309 equivalent, never ATF+4, and set the level hot. Our AS69RC 10-quart service kit bundles the fluid with a filter if you would rather buy it all at once.
