2008 Chevrolet Silverado 2500 Hd Lug Nut Torque & Bolt Specs

The 2008 Chevrolet Silverado 2500 Hd lug nut torque is 140 ft-lbs (190 Nm), tightened with a 21mm socket on M14x1.5 studs. Torque in a star pattern in two passes (snug, then final), and re-check after the first 50–100 miles of driving. Use a calibrated torque wrench — not an impact gun — for the final pass.

Lug nut torque: 140 ft-lbs (190 Nm) · Socket size: 21mm · Thread: M14x1.5.

This page is the OEM-referenced fastener summary for the 2008 Chevrolet Silverado 2500 Hd. Use it before any maintenance or repair job where torque values matter — brake work, wheel changes, suspension service, engine teardowns, or oil changes. Specs are pulled from manufacturer service literature, cross-checked against community data, and updated as new chassis variants become available.

GM lug-nut torque clusters around 140 ft-lbs (190 Nm) for half-ton Silverado/Sierra and 100 ft-lbs for passenger cars like Malibu, Impala, and Cruze. GM heavy-duty trucks (2500HD/3500HD) jump to 165 ft-lbs. Most GM passenger cars use a 19mm socket; trucks moved from 22mm to 22mm-with-deep-well in 2014. Watch for GM's flat-flange lug nut design on the Silverado — the standard cone-seat aftermarket lugs will not seat correctly.

Common fastener categories on the 2008 Chevrolet Silverado 2500 Hd

Repair guidance for this model year

For 2008 model-year work: Always use a calibrated torque wrench for safety-critical fasteners, and replace lock washers and crush washers on every reassembly.

Tools you will need

Frequently asked questions

What is the lug nut torque on a 2008 Chevrolet Silverado 2500 Hd?

The OEM-specified lug-nut torque for the 2008 Chevrolet Silverado 2500 Hd is 140 ft-lbs (190 Nm), using a 21mm socket on M14x1.5 thread studs. Use a calibrated torque wrench in a star pattern, in two passes (50% and 100%), and re-check after 50-100 miles of driving.

What socket size do I need for the 2008 Chevrolet Silverado 2500 Hd lug nuts?

The 2008 Chevrolet Silverado 2500 Hd uses a 21mm socket. A 6-point impact-rated socket is recommended over a 12-point chrome socket — 12-points round off lug nuts under impact-driver use.

Are the 2008 Chevrolet Silverado 2500 Hd fasteners metric or SAE?

Metric is the standard for this vehicle. Most fasteners on this vehicle are metric (M6, M8, M10, M12, M14). Bring a full metric set; SAE substitutes can round the head. Bolt-head markings are the fastest way to confirm grade and material at the bench.

Other Chevrolet Silverado 2500 Hd years

Same model, different model year — fastener spec may change. Always confirm against the year for your VIN.

→ 2008 Chevrolet Silverado 2500 Hd oil drain plug torque & size

→ 2008 Chevrolet Silverado 2500 Hd suspension & steering torque specs (control arm, ball joint, tie rod)

→ 2008 Chevrolet Silverado 2500 Hd engine & transmission mount torque specs

All 120 2008 Chevrolet Silverado 2500 Hd fastener specs

Per-bolt torque, wrench size, and thread spec for the 2008 Chevrolet Silverado 2500 Hd, sourced from OEM service literature and verified against community shop data. Values pair imperial (ft-lb) and metric (Nm) where the manufacturer publishes both.

Drivetrain — 2008 Chevrolet Silverado 2500 Hd

Drivetrain and driveline fasteners for the 2008 Chevrolet Silverado 2500 Hd — axle, transmission, and differential plugs. Differential fill plug tightens to 24 lb-ft, takes a 3/8 inch driver, runs on 3/8-18 NPT threads, located at the differential housing. The transfer case mounting bolt uses a 18mm drive on a M12 x 1.75 thread, torqued to 37 lb-ft at the transmission/transfer case. At the driveshaft yoke, the driveshaft u-joint strap bolt torques to 15 lb-ft (1/2 inch drive, 5/16-18 thread). For the differential housing, plan for a 3/8 inch tool on a 3/8-18 NPT stud; final torque is 24 lb-ft (differential drain plug). Driveshaft center support bearing bolt tightens to 37 lb-ft, takes a 13mm driver, runs on M10 x 1.5 threads, located at the frame crossmember. The front differential actuator bolt uses a 10mm drive on a M8 x 1.25 thread, torqued to 18 lb-ft at the front axle housing. At the transfer case, the transfer case drain plug torques to 25 lb-ft (15mm drive, M14 x 1.5 thread). For the differential cover, plan for a 13mm tool on a M10 x 1.5 stud; final torque is 25 lb-ft (differential cover bolt).

Steering — 2008 Chevrolet Silverado 2500 Hd

Steering linkage fasteners on the 2008 Chevrolet Silverado 2500 Hd. The steering shaft pinch bolt uses a 13mm drive on a M10 x 1.5 thread, torqued to 22 lb-ft at the steering column. At the frame rail, the steering gear box mounting bolt torques to 110 lb-ft (21mm drive, M14 x 2.0 thread). For the pitman arm/knuckle, plan for a 21mm tool on a M14 x 1.5 stud; final torque is 44 lb-ft (drag link end nut). Power steering pump mounting bolt tightens to 37 lb-ft, takes a 15mm driver, runs on M10 x 1.5 threads, located at the engine block/bracket. The idler arm bolt uses a 18mm drive on a M12 x 1.75 thread, torqued to 60 lb-ft at the frame rail. At the steering gear/pump, the power steering hose fitting torques to 20 lb-ft (19mm drive, M16 x 1.5 thread). For the dash/firewall, plan for a 13mm tool on a M10 x 1.5 stud; final torque is 18 lb-ft (steering column bracket bolt). Pitman arm nut tightens to 184 lb-ft, takes a 30mm driver, runs on M20 x 1.5 threads, located at the steering gear output.

Electrical — 2008 Chevrolet Silverado 2500 Hd

Electrical fasteners on the 2008 Chevrolet Silverado 2500 Hd. At the engine block/bracket, the alternator mounting bolt torques to 37 lb-ft (15mm drive, M10 x 1.5 thread). For the battery tray, plan for a 13mm tool on a M8 x 1.25 stud; final torque is 18 lb-ft (battery hold-down bolt). Ground wire bolt tightens to 18 lb-ft, takes a 10mm driver, runs on M8 x 1.25 threads, located at the engine block/frame. The battery terminal bolt uses a 10mm drive on a M8 x 1.25 thread, torqued to 11 lb-ft at the battery post. At the rear bumper, the license plate screw torques to 2 lb-ft (7mm drive, 1/4-20 thread). For the various locations, plan for a 8mm tool on a M6 x 1.0 stud; final torque is 80 lb-in (wiring harness bracket bolt).

Body & Cab — 2008 Chevrolet Silverado 2500 Hd

Body & Cab fasteners on the 2008 Chevrolet Silverado 2500 Hd. For the radiator support, plan for a None tool on a Push Clip stud; final torque is Hand Tight (grille mounting clip). Fender mounting bolt tightens to 18 lb-ft, takes a 10mm driver, runs on M8 x 1.25 threads, located at the fender to cab. The bumper mounting bolt - front uses a 18mm drive on a M12 x 1.75 thread, torqued to 30 lb-ft at the frame horn. At the frame rail, the bumper mounting bolt - rear torques to 30 lb-ft (18mm drive, M12 x 1.75 thread). For the frame horn, plan for a 13mm tool on a M10 x 1.5 stud; final torque is 18 lb-ft (radiator support bolt). Door hinge bolt tightens to 20 lb-ft, takes a 13mm driver, runs on M10 x 1.5 threads, located at the door to cab pillar. The skid plate bolt uses a 13mm drive on a M8 x 1.25 thread, torqued to 18 lb-ft at the frame rail. At the cab to frame, the cab mount bolt torques to 74 lb-ft (18mm drive, M12 x 1.75 thread). For the bed rail to tailgate, plan for a 13mm tool on a M8 x 1.25 stud; final torque is 20 lb-ft (tailgate hinge bolt). Bed rail tie-down tightens to 15 lb-ft, takes a 13mm driver, runs on M8 x 1.25 threads, located at the bed rail. The tow hook bolt uses a 18mm drive on a M12 x 1.75 thread, torqued to 50 lb-ft at the frame horn. At the bed to frame, the bed mounting bolt torques to 44 lb-ft (13mm drive, M10 x 1.5 thread). For the hood to fender, plan for a 13mm tool on a M10 x 1.5 stud; final torque is 18 lb-ft (hood hinge bolt). Running board mounting bolt tightens to 35 lb-ft, takes a 13mm driver, runs on M10 x 1.5 threads, located at the cab/frame. The door striker bolt uses a 10mm drive on a M8 x 1.25 thread, torqued to 18 lb-ft at the door jamb.

Transmission — 2008 Chevrolet Silverado 2500 Hd

Transmission fasteners on the 2008 Chevrolet Silverado 2500 Hd. Starter motor bolt tightens to 37 lb-ft, takes a 15mm driver, runs on M10 x 1.5 threads, located at the bell housing. The park/neutral switch bolt uses a 8mm drive on a M6 x 1.0 thread, torqued to 80 lb-in at the transmission case. At the bell housing, the transmission to engine bolt torques to 37 lb-ft (18mm drive, M12 x 1.75 thread). For the transmission case, plan for a 17mm tool on a M14 x 1.5 stud; final torque is 26 lb-ft (transmission cooler line fitting). Torque converter bolt tightens to 46 lb-ft, takes a 15mm driver, runs on M10 x 1.5 threads, located at the flexplate. The transmission pan bolt uses a 10mm drive on a M8 x 1.25 thread, torqued to 10 lb-ft at the transmission pan. At the frame rail, the transmission crossmember bolt torques to 70 lb-ft (18mm drive, M12 x 1.75 thread). For the transmission top, plan for a 8mm tool on a M6 x 1.0 stud; final torque is 60 lb-in (transmission vent tube bolt). Shift linkage bolt tightens to 15 lb-ft, takes a 10mm driver, runs on M8 x 1.25 threads, located at the transmission shifter. The transmission mount bolt uses a 18mm drive on a M12 x 1.75 thread, torqued to 37 lb-ft at the crossmember.

Engine - Bottom End — 2008 Chevrolet Silverado 2500 Hd

Engine - Bottom End fasteners on the 2008 Chevrolet Silverado 2500 Hd. The oil drain plug uses a 15mm drive on a M12x1.75 thread, torqued to 18 ft-lbs (25 Nm) at the oil pan. At the engine block, the timing chain cover bolt torques to 18 lb-ft (10mm drive, M8 x 1.25 thread). For the intake manifold/block, plan for a 10mm tool on a M8 x 1.25 stud; final torque is 11 lb-ft (thermostat housing bolt). Crankshaft position sensor bolt tightens to 80 lb-in, takes a 8mm driver, runs on M6 x 1.0 threads, located at the engine block/timing cover. The water pump bolt uses a 10mm drive on a M8 x 1.25 thread, torqued to 11 lb-ft at the timing cover. At the transmission to crossmember, the engine mount bolt - rear torques to 37 lb-ft (18mm drive, M12 x 1.75 thread). For the engine block, plan for a 12mm tool on a M8 x 1.25 stud; final torque is 18 lb-ft (knock sensor bolt). Oil filter adapter bolt tightens to 18 lb-ft, takes a 10mm driver, runs on M8 x 1.25 threads, located at the engine block. The crankshaft pulley bolt uses a 24mm drive on a M16 x 2.0 thread, torqued to TTY: 37+140° at the crankshaft. At the oil pan, the oil pan bolt torques to 18 lb-ft (10mm drive, M8 x 1.25 thread). For the engine block to frame, plan for a 18mm tool on a M12 x 1.75 stud; final torque is 59 lb-ft (engine mount bolt - front). Flywheel bolt tightens to TTY: 15+60°, takes a 15mm driver, runs on M12 x 1.75 threads, located at the crankshaft.

Engine - Top End — 2008 Chevrolet Silverado 2500 Hd

Engine - Top End fasteners on the 2008 Chevrolet Silverado 2500 Hd. At the valve cover, the pcv valve grommet bolt torques to 60 lb-in (8mm drive, M6 x 1.0 thread). For the intake manifold, plan for a 8mm tool on a M6 x 1.0 stud; final torque is 89 lb-in (throttle body bolt). Ignition coil bolt tightens to 70 lb-in, takes a 8mm driver, runs on M6 x 1.0 threads, located at the valve cover. The fuel injector retainer bolt uses a 8mm drive on a M6 x 1.0 thread, torqued to 80 lb-in at the fuel rail. At the throttle body/air box, the air intake tube clamp torques to 40 lb-in (8mm drive, M6 x 1.0 thread). For the cylinder head, plan for a 15mm tool on a M11 x 2.0 stud; final torque is TTY: 22+90° (cylinder head bolt). Exhaust manifold bolt tightens to 18 lb-ft, takes a 13mm driver, runs on M8 x 1.25 threads, located at the exhaust manifold. The valve cover bolt uses a 10mm drive on a M8 x 1.25 thread, torqued to 106 lb-in at the valve cover. At the cylinder head, the exhaust manifold stud torques to 15 lb-ft (13mm drive, M8 x 1.25 thread). For the intake manifold, plan for a 8mm tool on a M6 x 1.0 stud; final torque is 70 lb-in (map sensor bolt). Egr valve bolt tightens to 15 lb-ft, takes a 10mm driver, runs on M8 x 1.25 threads, located at the intake manifold. The camshaft position sensor bolt uses a 8mm drive on a M6 x 1.0 thread, torqued to 80 lb-in at the cylinder head/timing cover. At the intake manifold, the fuel rail bolt torques to 89 lb-in (8mm drive, M6 x 1.0 thread). For the cylinder head, plan for a 16mm tool on a M14 x 1.25 stud; final torque is 11 lb-ft (spark plug). Intake manifold bolt tightens to 89 lb-in, takes a 10mm driver, runs on M8 x 1.25 threads, located at the intake manifold.

Wheels & Brakes — 2008 Chevrolet Silverado 2500 Hd

Wheels & Brakes fasteners on the 2008 Chevrolet Silverado 2500 Hd. For the wheel hub/knuckle, plan for a 8mm tool on a M6 x 1.0 stud; final torque is 80 lb-in (abs sensor bolt). Brake line banjo bolt tightens to 30 lb-ft, takes a 12mm driver, runs on M10 x 1.0 threads, located at the brake caliper. The brake caliper bracket bolt uses a 21mm drive on a M14 x 2.0 thread, torqued to 140 lb-ft at the front/rear caliper bracket. At the wheels, the wheel lug nut torques to 140 ft-lbs (190 Nm) (21mm drive, M14x1.5 thread). For the firewall/booster, plan for a 13mm tool on a M10 x 1.5 stud; final torque is 20 lb-ft (brake master cylinder mounting nut). Brake rotor set screw tightens to 35 lb-in, takes a 10mm driver, runs on M8 x 1.25 threads, located at the brake rotor. The parking brake cable bolt uses a 13mm drive on a M8 x 1.25 thread, torqued to 18 lb-ft at the rear caliper/drum. At the front/rear brake caliper, the brake caliper mounting bolt torques to 80 lb-ft (18mm drive, M12 x 1.75 thread). For the frame/suspension, plan for a 10mm tool on a M8 x 1.25 stud; final torque is 15 lb-ft (brake hose bracket bolt). Wheel speed sensor harness clip tightens to 60 lb-in, takes a 8mm driver, runs on M6 x 1.0 threads, located at the wheel hub area.

Exhaust System — 2008 Chevrolet Silverado 2500 Hd

Exhaust System fasteners on the 2008 Chevrolet Silverado 2500 Hd. Exhaust hanger bolt tightens to 18 lb-ft, takes a 13mm driver, runs on M8 x 1.25 threads, located at the frame/body mount. The oxygen sensor uses a 22mm drive on a M18 x 1.5 thread, torqued to 31 lb-ft at the exhaust pipe. At the exhaust manifold, the exhaust pipe flange bolt torques to 25 lb-ft (15mm drive, M10 x 1.5 thread). For the muffler connection, plan for a 13mm tool on a M8 x 1.25 stud; final torque is 25 lb-ft (muffler clamp bolt). Tailpipe clamp bolt tightens to 25 lb-ft, takes a 13mm driver, runs on M8 x 1.25 threads, located at the tailpipe connection. The catalytic converter bolt uses a 15mm drive on a M10 x 1.5 thread, torqued to 37 lb-ft at the exhaust pipe flange.

Front Suspension — 2008 Chevrolet Silverado 2500 Hd

Front Suspension fasteners on the 2008 Chevrolet Silverado 2500 Hd. The stabilizer bar link nut uses a 18mm drive on a M10 x 1.5 thread, torqued to 17 lb-ft at the sway bar to control arm. At the wheel hub, the steering knuckle to hub bolt torques to 133 lb-ft (18mm drive, M12 x 1.75 thread). For the steering knuckle, plan for a 21mm tool on a M14 x 1.5 stud; final torque is 37 lb-ft (upper control arm ball joint nut). Lower control arm ball joint nut tightens to 111 lb-ft, takes a 27mm driver, runs on M18 x 1.5 threads, located at the steering knuckle. The shock absorber upper nut uses a 13mm drive on a M10 x 1.5 thread, torqued to 18 lb-ft at the upper shock mount. At the frame bracket, the upper control arm frame bolt torques to 140 lb-ft (21mm drive, M14 x 2.0 thread). For the torsion bar crossmember, plan for a 18mm tool on a M12 x 1.75 stud; final torque is Variable (torsion bar adjuster bolt). Hub bearing retaining bolt tightens to 177 lb-ft, takes a 18mm driver, runs on M12 x 1.75 threads, located at the steering knuckle. The tie rod end nut uses a 21mm drive on a M14 x 1.5 thread, torqued to 44 lb-ft at the steering knuckle. At the frame bracket, the lower control arm frame bolt torques to 107 lb-ft (21mm drive, M14 x 2.0 thread). For the frame rail, plan for a 13mm tool on a M10 x 1.5 stud; final torque is 37 lb-ft (stabilizer bar bracket bolt). Shock absorber lower bolt tightens to 59 lb-ft, takes a 18mm driver, runs on M14 x 1.5 threads, located at the lower control arm.

Rear Suspension — 2008 Chevrolet Silverado 2500 Hd

Rear Suspension fasteners on the 2008 Chevrolet Silverado 2500 Hd. At the axle bracket, the rear shock absorber lower bolt torques to 70 lb-ft (18mm drive, M12 x 1.75 thread). For the axle to sway bar, plan for a 15mm tool on a M10 x 1.5 stud; final torque is 44 lb-ft (rear stabilizer bar link bolt). Rear axle vent tube bolt tightens to 60 lb-in, takes a 8mm driver, runs on M6 x 1.0 threads, located at the axle housing. The track bar axle bolt uses a 21mm drive on a M14 x 2.0 thread, torqued to 110 lb-ft at the rear axle. At the rear spring shackle, the leaf spring rear shackle bolt torques to 70 lb-ft (21mm drive, M14 x 2.0 thread). For the frame rail, plan for a 21mm tool on a M14 x 2.0 stud; final torque is 110 lb-ft (track bar frame bolt). Rear shock absorber upper bolt tightens to 70 lb-ft, takes a 18mm driver, runs on M12 x 1.75 threads, located at the frame rail. The leaf spring u-bolt uses a 5/8 inch drive on a 7/16-20 thread, torqued to 52 lb-ft at the axle to spring. At the frame rail, the rear stabilizer bar bracket bolt torques to 37 lb-ft (15mm drive, M10 x 1.5 thread). For the front spring hanger, plan for a 21mm tool on a M14 x 2.0 stud; final torque is 95 lb-ft (leaf spring front eye bolt).

Interior — 2008 Chevrolet Silverado 2500 Hd

Interior fasteners on the 2008 Chevrolet Silverado 2500 Hd. For the b-pillar/floor, plan for a 18mm tool on a M12 x 1.75 stud; final torque is 37 lb-ft (seat belt anchor bolt). Sun visor screw tightens to Hand Tight, takes a 8mm driver, runs on M6 x 1.0 threads, located at the headliner. The center console bolt uses a 8mm drive on a M6 x 1.0 thread, torqued to 80 lb-in at the floor/tunnel. At the steering column, the steering wheel nut torques to 140 ft-lbs (190 Nm) (24mm drive, M14x1.5 thread). For the dash to firewall, plan for a 10mm tool on a M8 x 1.25 stud; final torque is 18 lb-ft (dashboard mounting bolt). Floor mat clip tightens to Hand Tight, takes a None driver, runs on Push Clip threads, located at the floor pan. The seat mounting bolt uses a 13mm drive on a M10 x 1.5 thread, torqued to 37 lb-ft at the seat track to floor. At the dashboard, the glove box hinge screw torques to Hand Tight (8mm drive, M6 x 1.0 thread).

New to torquing wheels? Read our How lug nut torque works — the complete guide for star-pattern sequence, re-torque intervals, and how to read a lug spec — then use the 2008 Chevrolet Silverado 2500 Hd numbers above.

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