2008 Chevrolet Silverado 3500 Hd Srw Lug Nut Torque & Bolt Specs

The 2008 Chevrolet Silverado 3500 Hd Srw lug nut torque is TTY: 15+60°, tightened with a 15mm socket on M12 x 1.75 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: TTY: 15+60° · Socket size: 15mm · Thread: M12 x 1.75.

This page is the OEM-referenced fastener summary for the 2008 Chevrolet Silverado 3500 Hd Srw. 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 3500 Hd Srw

Wheel / lug nut torque and thread spec (covered above)
Brake caliper bracket bolts (typically 80-130 ft-lbs) and slide/guide pins (18-35 ft-lbs)
Engine oil drain plug torque — rarely above 30 ft-lbs; always use a new crush washer
Transmission pan, valve cover, and intake manifold bolts (low torque, often 89-106 in-lbs)
Suspension control arm, sway bar, tie rod end and ball joint torque
Spark plug torque (typically 10-15 ft-lbs on aluminum heads — do not exceed)
Differential cover bolts (RWD/4WD only) and transfer case fasteners

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

Metric socket set (8mm-22mm), 6-point impact-rated
Calibrated torque wrench (10-150 ft-lbs covers most automotive jobs; add a 0-250 ft-lbs wrench for truck lug nuts)
Breaker bar (24" minimum) for initial loosening
Penetrating oil (PB Blaster or Kroil) for any fastener over 5 years old
Anti-seize on stainless or dissimilar-metal threads; thread-locker (Loctite blue) on critical reassembly

Frequently asked questions

What is the lug nut torque on a 2008 Chevrolet Silverado 3500 Hd Srw?

The OEM-specified lug-nut torque for the 2008 Chevrolet Silverado 3500 Hd Srw is TTY: 15+60°, using a 15mm socket on M12 x 1.75 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 3500 Hd Srw lug nuts?

The 2008 Chevrolet Silverado 3500 Hd Srw uses a 15mm 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 3500 Hd Srw 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 3500 Hd Srw years

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

→ 2008 Chevrolet Silverado 3500 Hd Srw oil drain plug torque & size

→ 2008 Chevrolet Silverado 3500 Hd Srw suspension & steering torque specs (control arm, ball joint, tie rod)

→ 2008 Chevrolet Silverado 3500 Hd Srw engine & transmission mount torque specs

All 120 2008 Chevrolet Silverado 3500 Hd Srw fastener specs

Per-bolt torque, wrench size, and thread spec for the 2008 Chevrolet Silverado 3500 Hd Srw, 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 3500 Hd Srw

Drivetrain and driveline fasteners for the 2008 Chevrolet Silverado 3500 Hd Srw — axle, transmission, and differential plugs. 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 driveshaft u-joint strap bolt uses a 1/2 inch drive on a 5/16-18 thread, torqued to 15 lb-ft at the driveshaft yoke. At the differential housing, the differential drain plug torques to 24 lb-ft (3/8 inch drive, 3/8-18 NPT thread). For the front axle housing, plan for a 10mm tool on a M8 x 1.25 stud; final torque is 18 lb-ft (front differential actuator bolt). Differential cover bolt tightens to 25 lb-ft, takes a 13mm driver, runs on M10 x 1.5 threads, located at the differential cover. The transfer case drain plug uses a 15mm drive on a M14 x 1.5 thread, torqued to 25 lb-ft at the transfer case. At the transmission/transfer case, the transfer case mounting bolt torques to 37 lb-ft (18mm drive, M12 x 1.75 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 fill plug).

Steering — 2008 Chevrolet Silverado 3500 Hd Srw

Steering linkage fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. 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 engine block/bracket, the power steering pump mounting bolt torques to 37 lb-ft (15mm drive, M10 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). Steering gear box mounting bolt tightens to 110 lb-ft, takes a 21mm driver, runs on M14 x 2.0 threads, located at the frame rail. The pitman arm nut uses a 30mm drive on a M20 x 1.5 thread, torqued to 184 lb-ft at the steering gear output. At the steering column, the steering shaft pinch bolt torques to 22 lb-ft (13mm drive, M10 x 1.5 thread). For the steering gear/pump, plan for a 19mm tool on a M16 x 1.5 stud; final torque is 20 lb-ft (power steering hose fitting). Drag link end nut tightens to 44 lb-ft, takes a 21mm driver, runs on M14 x 1.5 threads, located at the pitman arm/knuckle.

Electrical — 2008 Chevrolet Silverado 3500 Hd Srw

Electrical fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. 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). Alternator 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 battery hold-down bolt uses a 13mm drive on a M8 x 1.25 thread, torqued to 18 lb-ft at the battery tray. At the battery post, the battery terminal bolt torques to 11 lb-ft (10mm drive, M8 x 1.25 thread). For the engine block/frame, plan for a 10mm tool on a M8 x 1.25 stud; final torque is 18 lb-ft (ground wire bolt).

Wheels & Brakes — 2008 Chevrolet Silverado 3500 Hd Srw

Wheels & Brakes fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. For the front/rear caliper bracket, plan for a 21mm tool on a M14x2.0 stud; final torque is 140 lb-ft (brake caliper bracket bolt). Brake hose bracket bolt tightens to 15 lb-ft, takes a 10mm driver, runs on M8 x 1.25 threads, located at the frame/suspension. The brake line banjo bolt uses a 12mm drive on a M10 x 1.0 thread, torqued to 30 lb-ft at the brake caliper. At the brake rotor, the brake rotor set screw torques to 35 lb-in (10mm drive, M8 x 1.25 thread). For the front/rear brake caliper, plan for a 18mm tool on a M12x1.75 stud; final torque is 80 lb-ft (brake caliper mounting bolt). Parking brake cable bolt tightens to 18 lb-ft, takes a 13mm driver, runs on M8 x 1.25 threads, located at the rear caliper/drum. The brake master cylinder mounting nut uses a 13mm drive on a M10 x 1.5 thread, torqued to 20 lb-ft at the firewall/booster. At the wheel hub area, the wheel speed sensor harness clip torques to 60 lb-in (8mm drive, M6 x 1.0 thread). 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). Wheel lug nut tightens to 140 ft-lbs (190 Nm), takes a 21mm driver, runs on M14x1.5 threads, located at the wheels.

Front Suspension — 2008 Chevrolet Silverado 3500 Hd Srw

Front Suspension fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. Lower control arm frame bolt tightens to 107 lb-ft, takes a 21mm driver, runs on M14 x 2.0 threads, located at the frame bracket. The steering knuckle to hub bolt uses a 18mm drive on a M12 x 1.75 thread, torqued to 133 lb-ft at the wheel hub. At the frame rail, the stabilizer bar bracket bolt torques to 37 lb-ft (13mm drive, M10 x 1.5 thread). For the lower control arm, plan for a 18mm tool on a M14 x 1.5 stud; final torque is 59 lb-ft (shock absorber lower bolt). Shock absorber upper nut tightens to 18 lb-ft, takes a 13mm driver, runs on M10 x 1.5 threads, located at the upper shock mount. The upper control arm frame bolt uses a 21mm drive on a M14 x 2.0 thread, torqued to 140 lb-ft at the frame bracket. At the steering knuckle, the hub bearing retaining bolt torques to 177 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 44 lb-ft (tie rod end nut). Upper control arm ball joint nut tightens to 37 lb-ft, takes a 21mm driver, runs on M14 x 1.5 threads, located at the steering knuckle. 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 steering knuckle, the lower control arm ball joint nut torques to 111 lb-ft (27mm drive, M18 x 1.5 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).

Body & Cab — 2008 Chevrolet Silverado 3500 Hd Srw

Body & Cab fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. The hood hinge bolt uses a 13mm drive on a M10 x 1.5 thread, torqued to 18 lb-ft at the hood to fender. At the frame horn, the radiator support bolt torques to 18 lb-ft (13mm drive, M10 x 1.5 thread). For the bed rail, plan for a 13mm tool on a M8 x 1.25 stud; final torque is 15 lb-ft (bed rail tie-down). Skid plate bolt tightens to 18 lb-ft, takes a 13mm driver, runs on M8 x 1.25 threads, located at the frame rail. The running board mounting bolt uses a 13mm drive on a M10 x 1.5 thread, torqued to 35 lb-ft at the cab/frame. 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). 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 bed mounting bolt uses a 13mm drive on a M10 x 1.5 thread, torqued to 44 lb-ft at the bed to frame. At the frame horn, the bumper mounting bolt - front torques to 30 lb-ft (18mm drive, M12 x 1.75 thread). For the fender to cab, plan for a 10mm tool on a M8 x 1.25 stud; final torque is 18 lb-ft (fender mounting bolt). Bumper mounting bolt - rear tightens to 30 lb-ft, takes a 18mm driver, runs on M12 x 1.75 threads, located at the frame rail. The door striker bolt uses a 10mm drive on a M8 x 1.25 thread, torqued to 18 lb-ft at the door jamb. At the radiator support, the grille mounting clip torques to Hand Tight (None drive, Push Clip thread). For the frame horn, plan for a 18mm tool on a M12 x 1.75 stud; final torque is 50 lb-ft (tow hook bolt).

Engine - Top End — 2008 Chevrolet Silverado 3500 Hd Srw

Engine - Top End fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. At the cylinder head, the spark plug torques to 11 lb-ft (16mm drive, M14 x 1.25 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). 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 exhaust manifold, the exhaust manifold bolt torques to 18 lb-ft (13mm drive, M8 x 1.25 thread). For the valve cover, plan for a 10mm tool on a M8 x 1.25 stud; final torque is 106 lb-in (valve cover bolt). Air intake tube clamp tightens to 40 lb-in, takes a 8mm driver, runs on M6 x 1.0 threads, located at the throttle body/air box. The pcv valve grommet bolt uses a 8mm drive on a M6 x 1.0 thread, torqued to 60 lb-in at the valve cover. At the cylinder head/timing cover, the camshaft position sensor bolt torques to 80 lb-in (8mm drive, M6 x 1.0 thread). For the intake manifold, plan for a 10mm tool on a M8 x 1.25 stud; final torque is 89 lb-in (intake manifold bolt). Exhaust manifold stud tightens to 15 lb-ft, takes a 13mm driver, runs on M8 x 1.25 threads, located at the cylinder head. The throttle body bolt uses a 8mm drive on a M6 x 1.0 thread, torqued to 89 lb-in at the intake manifold. At the intake manifold, the egr valve bolt torques to 15 lb-ft (10mm 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 89 lb-in (fuel rail bolt). Map sensor bolt tightens to 70 lb-in, takes a 8mm driver, runs on M6 x 1.0 threads, located at the intake manifold.

Exhaust System — 2008 Chevrolet Silverado 3500 Hd Srw

Exhaust System fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. 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 exhaust hanger bolt uses a 13mm drive on a M8 x 1.25 thread, torqued to 18 lb-ft at the frame/body mount. At the exhaust pipe, the oxygen sensor torques to 31 lb-ft (22mm drive, M18 x 1.5 thread). For the exhaust pipe flange, plan for a 15mm tool on a M10 x 1.5 stud; final torque is 37 lb-ft (catalytic converter bolt). Exhaust pipe flange bolt tightens to 25 lb-ft, takes a 15mm driver, runs on M10 x 1.5 threads, located at the exhaust manifold.

Engine - Bottom End — 2008 Chevrolet Silverado 3500 Hd Srw

Engine - Bottom End fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. Knock sensor bolt tightens to 18 lb-ft, takes a 12mm driver, runs on M8 x 1.25 threads, located at the engine block. The crankshaft position sensor bolt uses a 8mm drive on a M6 x 1.0 thread, torqued to 80 lb-in at the engine block/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 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. The thermostat housing bolt uses a 10mm drive on a M8 x 1.25 thread, torqued to 11 lb-ft at the intake manifold/block. At the engine block, the oil filter adapter bolt torques to 18 lb-ft (10mm drive, M8 x 1.25 thread). For the engine block, plan for a 10mm tool on a M8 x 1.25 stud; final torque is 18 lb-ft (timing chain cover bolt). Oil pan bolt tightens to 18 lb-ft, takes a 10mm driver, runs on M8 x 1.25 threads, located at the oil pan. 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 crankshaft, the crankshaft pulley bolt torques to TTY: 37+140° (24mm drive, M16 x 2.0 thread). For the oil pan, plan for a 15mm tool on a M14x1.5 stud; final torque is 18 ft-lbs (25 Nm) (oil drain plug).

Interior — 2008 Chevrolet Silverado 3500 Hd Srw

Interior fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. The glove box hinge screw uses a 8mm drive on a M6 x 1.0 thread, torqued to Hand Tight at the dashboard. At the steering column, the steering wheel nut torques to 140 ft-lbs (190 Nm) (24mm drive, M14x1.5 thread). For the headliner, plan for a 8mm tool on a M6 x 1.0 stud; final torque is Hand Tight (sun visor screw). Seat belt anchor bolt tightens to 37 lb-ft, takes a 18mm driver, runs on M12 x 1.75 threads, located at the b-pillar/floor. The dashboard mounting bolt uses a 10mm drive on a M8 x 1.25 thread, torqued to 18 lb-ft at the dash to firewall. At the floor pan, the floor mat clip torques to Hand Tight (None drive, Push Clip thread). For the seat track to floor, plan for a 13mm tool on a M10 x 1.5 stud; final torque is 37 lb-ft (seat mounting bolt). Center console bolt tightens to 80 lb-in, takes a 8mm driver, runs on M6 x 1.0 threads, located at the floor/tunnel.

Rear Suspension — 2008 Chevrolet Silverado 3500 Hd Srw

Rear Suspension fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. At the axle to sway bar, the rear stabilizer bar link bolt torques to 44 lb-ft (15mm drive, M10 x 1.5 thread). For the axle bracket, plan for a 18mm tool on a M12 x 1.75 stud; final torque is 70 lb-ft (rear shock absorber lower bolt). Track bar axle bolt tightens to 110 lb-ft, takes a 21mm driver, runs on M14 x 2.0 threads, located at the rear axle. The rear axle vent tube bolt uses a 8mm drive on a M6 x 1.0 thread, torqued to 60 lb-in at the axle housing. At the axle to spring, the leaf spring u-bolt torques to 52 lb-ft (5/8 inch drive, 7/16-20 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). Leaf spring front eye bolt tightens to 95 lb-ft, takes a 21mm driver, runs on M14 x 2.0 threads, located at the front spring hanger. The rear stabilizer bar bracket bolt uses a 15mm drive on a M10 x 1.5 thread, torqued to 37 lb-ft at the frame rail. At the frame rail, the rear shock absorber upper bolt torques to 70 lb-ft (18mm drive, M12 x 1.75 thread). For the rear spring shackle, plan for a 21mm tool on a M14 x 2.0 stud; final torque is 70 lb-ft (leaf spring rear shackle bolt).

Transmission — 2008 Chevrolet Silverado 3500 Hd Srw

Transmission fasteners on the 2008 Chevrolet Silverado 3500 Hd Srw. For the bell housing, plan for a 15mm tool on a M10 x 1.5 stud; final torque is 37 lb-ft (starter motor 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 crossmember bolt uses a 18mm drive on a M12 x 1.75 thread, torqued to 70 lb-ft at the frame rail. At the transmission top, the transmission vent tube bolt torques to 60 lb-in (8mm drive, M6 x 1.0 thread). For the bell housing, plan for a 18mm tool on a M12 x 1.75 stud; final torque is 37 lb-ft (transmission to engine bolt). Park/neutral switch bolt tightens to 80 lb-in, takes a 8mm driver, runs on M6 x 1.0 threads, located at the transmission case. The transmission cooler line fitting uses a 17mm drive on a M14 x 1.5 thread, torqued to 26 lb-ft at the transmission case. At the crossmember, the transmission mount bolt torques to 37 lb-ft (18mm drive, M12 x 1.75 thread). For the flexplate, plan for a 15mm tool on a M10 x 1.5 stud; final torque is 46 lb-ft (torque converter bolt). Transmission pan bolt tightens to 10 lb-ft, takes a 10mm driver, runs on M8 x 1.25 threads, located at the transmission pan.

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 3500 Hd Srw numbers above.

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