2020 GMC Sierra 1500 Transmission Fluid & Service
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick Answer
- Transmission Make/Model: GM 10L80 (10-speed automatic)
- OEM Fluid Spec: Dexron ULV Automatic Transmission Fluid
- Drain & Fill Capacity: Approximately 7-8 quarts (verify with service manual)
- Full Overhaul Capacity: Approximately 13.5 quarts (12.8 liters) (verify with service manual)
- Filter OEM Part Number: Verify with dealer or service manual
- Recommended Service Interval: 97,500 miles (normal service); 45,000 miles (severe duty/towing)
Fluid Type Explained: Dexron ULV
The 2020 GMC Sierra 1500, when equipped with the 10-speed automatic transmission (GM 10L80), requires Dexron ULV (Ultra Low Viscosity) automatic transmission fluid. This is a crucial detail, as using any other type of fluid can lead to premature wear, poor shifting performance, and potentially severe transmission damage. Dexron ULV is specifically engineered to meet the demanding requirements of modern transmissions, particularly those with a higher number of gears like the 10L80.
The "ULV" designation signifies its extremely low viscosity. This low viscosity fluid is designed to reduce parasitic drag within the transmission, which in turn contributes to improved fuel economy. It also offers exceptional friction durability, ensuring smooth and consistent gear changes throughout the transmission
More specs for the 2020 GMC Sierra 1500
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
2020 GMC Sierra 1500 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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