2018 GMC Sierra 2500HD Torque Specifications
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 Reference
| Fastener | Torque (ft-lb / Nm) | Notes |
|---|---|---|
| Wheel Lug Nuts | 140 ft-lb / 190 Nm | 8-lug wheels. Re-torque after 50-100 miles. |
| Oil Drain Plug | 18 ft-lb / 25 Nm | All engines |
| Transmission Drain Plug | N/A | Allison transmissions are filled for life and have no drain plug. |
| Brake Caliper Bracket Bolts | 120-130 ft-lb / 163-176 Nm | Front and rear. |
| Brake Caliper Slide Pins | 70-80 ft-lb / 95-108 Nm | Front and rear. |
| Axle Nut | 175-185 ft-lb / 237-251 Nm | Always use a new cotter pin. |
| Spark Plugs | 15-20 ft-lb / 20-27 Nm | Gas engine models. |
| Valve Cover Bolts | 8-10 ft-lb / 11-14 Nm | All engines |
Wheel Lug Torque Pattern
For 8-lug wheels like those on the 2018 GMC Sierra 2500HD, use a star or cross pattern to ensure even clamping force. This prevents wheel hub and rotor distortion. Start with one lug nut, then move to the one directly across from it, then skip one and so on.
Brake Torque Notes
Brake caliper bracket bolts are a critical fastener. Always use a calibrated torque wrench. For brake caliper slide pins, it is important to clean and lubricate them with a high-temperature silicone-based grease before reassembly.
Why Torque Matters
Torque is a measure of rotational force. Applying the correct torque to a fastener is critical for safety and reliability. Under-torqued fasteners can loosen over time, while over-torqued fasteners can stretch or break, or damage the components they are holding. A calibrated torque wrench is a must-have tool for any DIY mechanic.
Disclaimer: The torque specifications provided here are for general reference only. Critical fasteners should always be verified in the OEM service manual for your specific vehicle configuration.
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More specs for the 2018 GMC Sierra 2500HD
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.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
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
2014 Sierra 2500HD
2015 Sierra 2500HD
2016 Sierra 2500HD
2017 Sierra 2500HD
2019 Sierra 2500HD
2020 Sierra 2500HD
Maintenance & repair guides
2018 GMC Sierra 2500HD 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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