2021 Ram 2500 Transmission Fluid & Service
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Quick answer
- Transmission Make/Model: Aisin AS69RC
- OEM Fluid Spec: Mopar ATF+4 (MS-9602)
- Drain & Fill Capacity: Approximately 7–8 quarts
- Full Overhaul Capacity: Approximately 17.5 quarts
- Filter OEM Part Number: Verify with dealer or service manual (typically a pan filter and an inline filter)
- Recommended Service Interval: Normal Duty: 60,000 miles; Severe Duty/Towing: 30,000 miles
Fluid type explained
The 2021 Ram 2500 equipped with the 6.7L Cummins turbo-diesel engine predominantly uses the Aisin AS69RC heavy-duty automatic transmission. This transmission requires Mopar ATF+4 (MS-9602) transmission fluid. It is crucial to use only ATF+4, as using other types of fluid can lead to transmission damage and void your warranty. ATF+4 is a synthetic-based fluid designed to provide consistent shift quality, reduce wear, and offer long-term extended performance, even under the high thermal demands of heavy-duty towing and hauling.
While there are many aftermarket fluids that claim to be
More specs for the 2021 Ram 2500
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2021 Ram 2500 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-06-26.