1998 Ford F 350 Lariat Lug Nut Torque & Bolt Specs

The 1998 Ford F 350 Lariat lug nut torque is 100 ft-lbs, 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: 100 ft-lbs · Socket size: 21mm · Thread: M14x1.5.

This page is the OEM-referenced fastener summary for the 1998 Ford F 350 Lariat. 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.

Ford lug-nut torque varies more by chassis than most makes — 100 ft-lbs for Focus/Fusion/Fiesta, 150 ft-lbs for half-ton F-150, and 165 ft-lbs for Super Duty F-250/F-350. F-150s from 2004-2014 use a 21mm OEM socket, while 2015+ aluminum-body trucks moved to the larger 22mm. Ford torque-to-yield (TTY) head bolts are standard from the early 2000s — do not reuse them, ever.

Common fastener categories on the 1998 Ford F 350 Lariat

Repair guidance for this model year

Heads up for 1998 Ford F 350 Lariat owners: Vehicles this age frequently have seized fasteners due to thread corrosion. Apply penetrating oil (PB Blaster, Kroil) 24 hours before any wrenching, and have a thread chaser on hand. Lug studs are particularly prone to thread damage at this age; if a nut spins on without engaging, the stud is stretched and must be replaced before the wheel goes back on.

Tools you will need

Frequently asked questions

What is the lug nut torque on a 1998 Ford F 350 Lariat?

The OEM-specified lug-nut torque for the 1998 Ford F 350 Lariat is 100 ft-lbs, 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 1998 Ford F 350 Lariat lug nuts?

The 1998 Ford F 350 Lariat 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 1998 Ford F 350 Lariat 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 Ford F 350 Lariat years

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

→ 1998 Ford F 350 Lariat oil drain plug torque & size

→ 1998 Ford F 350 Lariat suspension & steering torque specs (control arm, ball joint, tie rod)

→ 1998 Ford F 350 Lariat engine & transmission mount torque specs

All 121 1998 Ford F 350 Lariat fastener specs

Per-bolt torque, wrench size, and thread spec for the 1998 Ford F 350 Lariat, sourced from OEM service literature and verified against community shop data. Values pair imperial (ft-lb) and metric (Nm) where the manufacturer publishes both.

Wheels — 1998 Ford F 350 Lariat

Wheel and lug nut spec for the 1998 Ford F 350 Lariat. For the wheel hub, plan for a 21mm tool on a M14x1.5 stud; final torque is 100 ft-lbs (lug nut - position 2). Lug nut - position 3 tightens to 100 ft-lbs, takes a 21mm driver, runs on M14x1.5 threads, located at the wheel hub. The wheel speed sensor bolt - front left uses a 8mm drive on a M6x1.0 thread, torqued to 8 ft-lbs at the wheel speed sensor. At the wheel speed sensor, the wheel speed sensor bolt - front right torques to 8 ft-lbs (8mm drive, M6x1.0 thread). For the wheel hub, plan for a 21mm tool on a M14x1.5 stud; final torque is 100 ft-lbs (lug nut - position 5). Hub bearing bolt - front left tightens to 65 ft-lbs, takes a 15mm driver, runs on M12x1.75 threads, located at the wheel hub. The hub bearing bolt - front right uses a 15mm drive on a M12x1.75 thread, torqued to 65 ft-lbs at the wheel hub. At the wheel speed sensor, the wheel speed sensor bolt - rear right torques to 8 ft-lbs (8mm drive, M6x1.0 thread). For the wheel hub, plan for a 15mm tool on a M12x1.75 stud; final torque is 65 ft-lbs (hub bearing bolt - rear right). Wheel speed sensor bolt - rear left tightens to 8 ft-lbs, takes a 8mm driver, runs on M6x1.0 threads, located at the wheel speed sensor. The lug nut - position 1 uses a 21mm drive on a M14x1.5 thread, torqued to 100 ft-lbs at the wheel hub. At the wheel hub, the hub bearing bolt - rear left torques to 65 ft-lbs (15mm drive, M12x1.75 thread). For the wheel hub, plan for a 21mm tool on a M14x1.5 stud; final torque is 100 ft-lbs (lug nut - position 4).

Brakes — 1998 Ford F 350 Lariat

Brake fasteners on the 1998 Ford F 350 Lariat — caliper bracket, slide pins, and banjo bolt torque follow. Brake line fitting - rear left tightens to 12 ft-lbs, takes a 11mm driver, runs on M10x1.0 threads, located at the brake line. The caliper bracket bolt - rear right upper uses a 18mm drive on a M14x1.5 thread, torqued to 85 ft-lbs at the caliper bracket. At the caliper bracket, the caliper bracket bolt - front right lower torques to 85 ft-lbs (18mm drive, M14x1.5 thread). For the caliper bracket, plan for a 18mm tool on a M14x1.5 stud; final torque is 85 ft-lbs (caliper bracket bolt - front right upper). Caliper bracket bolt - rear left upper tightens to 85 ft-lbs, takes a 18mm driver, runs on M14x1.5 threads, located at the caliper bracket. The caliper slide pin - front right lower uses a 13mm drive on a M10x1.5 thread, torqued to 25 ft-lbs at the caliper slide. At the caliper bracket, the caliper bracket bolt - rear right lower torques to 85 ft-lbs (18mm drive, M14x1.5 thread). For the caliper bracket, plan for a 18mm tool on a M14x1.5 stud; final torque is 85 ft-lbs (caliper bracket bolt - rear left lower). Brake line fitting - front right tightens to 12 ft-lbs, takes a 11mm driver, runs on M10x1.0 threads, located at the brake line. The caliper slide pin - front left upper uses a 13mm drive on a M10x1.5 thread, torqued to 25 ft-lbs at the caliper slide. At the caliper slide, the caliper slide pin - front right upper torques to 25 ft-lbs (13mm drive, M10x1.5 thread). For the caliper bracket, plan for a 18mm tool on a M14x1.5 stud; final torque is 85 ft-lbs (caliper bracket bolt - front left upper). Brake line fitting - front left tightens to 12 ft-lbs, takes a 11mm driver, runs on M10x1.0 threads, located at the brake line. The brake line fitting - rear right uses a 11mm drive on a M10x1.0 thread, torqued to 12 ft-lbs at the brake line. At the caliper slide, the caliper slide pin - front left lower torques to 25 ft-lbs (13mm drive, M10x1.5 thread). For the caliper bracket, plan for a 18mm tool on a M14x1.5 stud; final torque is 85 ft-lbs (caliper bracket bolt - front left lower).

Engine — 1998 Ford F 350 Lariat

Engine bolt-by-bolt torque for the 1998 Ford F 350 Lariat, including the long block, valve covers, and intake. The alternator bolt - adjuster uses a 13mm drive on a M10x1.5 thread, torqued to 30 ft-lbs at the alternator bracket. At the alternator bracket, the alternator bolt - lower torques to 30 ft-lbs (13mm drive, M10x1.5 thread). For the oil pan, plan for a 10mm tool on a M8x1.25 stud; final torque is 18 ft-lbs (oil pan bolt - front left). Valve cover bolt - rear tightens to 8 ft-lbs, takes a 8mm driver, runs on M8x1.25 threads, located at the valve cover. The cylinder head bolt - rear right uses a 10mm drive on a M10x1.5 thread, torqued to 65 ft-lbs at the cylinder head. At the water pump, the water pump bolt - upper torques to 18 ft-lbs (10mm drive, M8x1.25 thread). For the oil pan, plan for the right driver; final torque is 20 ft-lbs (27 Nm) (oil drain plug). Timing cover bolt - lower tightens to 15 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the timing cover. The cylinder head bolt - front left uses a 10mm drive on a M10x1.5 thread, torqued to 65 ft-lbs at the cylinder head. At the oil pan, the oil pan bolt - front right torques to 18 ft-lbs (10mm drive, M8x1.25 thread). For the exhaust manifold, plan for a 15mm tool on a M10x1.5 stud; final torque is 25 ft-lbs (exhaust manifold stud - rear). Oil pan bolt - rear left tightens to 18 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the oil pan. The timing cover bolt - side uses a 10mm drive on a M8x1.25 thread, torqued to 15 ft-lbs at the timing cover. At the starter motor, the starter bolt - lower torques to 35 ft-lbs (15mm drive, M12x1.75 thread). For the oil pan, plan for a 10mm tool on a M8x1.25 stud; final torque is 18 ft-lbs (oil pan bolt - side). Motor mount bolt - front right tightens to 75 ft-lbs, takes a 18mm driver, runs on M14x2.0 threads, located at the engine mount. The intake manifold bolt - right uses a 13mm drive on a M10x1.5 thread, torqued to 18 ft-lbs at the intake manifold. At the alternator bracket, the alternator bolt - upper torques to 30 ft-lbs (13mm drive, M10x1.5 thread). For the cylinder head, plan for a 10mm tool on a M10x1.5 stud; final torque is 65 ft-lbs (cylinder head bolt - rear left). Oil pan bolt - rear right tightens to 18 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the oil pan. The water pump bolt - side uses a 10mm drive on a M8x1.25 thread, torqued to 18 ft-lbs at the water pump. At the engine mount, the motor mount bolt - rear torques to 75 ft-lbs (18mm drive, M14x2.0 thread). For the cylinder head, plan for a 10mm tool on a M10x1.5 stud; final torque is 65 ft-lbs (cylinder head bolt - center). Valve cover bolt - left side tightens to 8 ft-lbs, takes a 8mm driver, runs on M8x1.25 threads, located at the valve cover. The starter bolt - upper uses a 15mm drive on a M12x1.75 thread, torqued to 35 ft-lbs at the starter motor. At the valve cover, the valve cover bolt - center torques to 8 ft-lbs (8mm drive, M8x1.25 thread). For the exhaust manifold, plan for a 15mm tool on a M10x1.5 stud; final torque is 25 ft-lbs (exhaust manifold stud - center). Valve cover bolt - front tightens to 8 ft-lbs, takes a 8mm driver, runs on M8x1.25 threads, located at the valve cover. The intake manifold bolt - left uses a 13mm drive on a M10x1.5 thread, torqued to 18 ft-lbs at the intake manifold. At the intake manifold, the intake manifold bolt - center torques to 18 ft-lbs (13mm drive, M10x1.5 thread). For the cylinder head, plan for a 10mm tool on a M10x1.5 stud; final torque is 65 ft-lbs (cylinder head bolt - front right). Motor mount bolt - front left tightens to 75 ft-lbs, takes a 18mm driver, runs on M14x2.0 threads, located at the engine mount. The exhaust manifold stud - front uses a 15mm drive on a M10x1.5 thread, torqued to 25 ft-lbs at the exhaust manifold. At the intake manifold, the intake manifold bolt - rear torques to 18 ft-lbs (13mm drive, M10x1.5 thread). For the intake manifold, plan for a 13mm tool on a M10x1.5 stud; final torque is 18 ft-lbs (intake manifold bolt - front). Water pump bolt - lower tightens to 18 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the water pump. The valve cover bolt - right side uses a 8mm drive on a M8x1.25 thread, torqued to 8 ft-lbs at the valve cover. At the timing cover, the timing cover bolt - upper torques to 15 ft-lbs (10mm drive, M8x1.25 thread).

Suspension — 1998 Ford F 350 Lariat

Suspension and chassis fastener torque for the 1998 Ford F 350 Lariat — strut, control arm, and sway bar values. At the leaf spring, the leaf spring u-bolt - rear left torques to 90 ft-lbs (19mm drive, M14x2.0 thread). For the strut top mount, plan for a 18mm tool on a M14x2.0 stud; final torque is 50 ft-lbs (strut mount bolt - rear right). Shock absorber bolt - lower tightens to 45 ft-lbs, takes a 15mm driver, runs on M12x1.75 threads, located at the shock absorber. The sway bar bushing bracket - rear right uses a 13mm drive on a M10x1.5 thread, torqued to 25 ft-lbs at the sway bar bushing. At the sway bar link, the sway bar link nut - front right torques to 35 ft-lbs (15mm drive, M10x1.5 thread). For the ball joint, plan for a 19mm tool on a M14x1.5 stud; final torque is 80 ft-lbs (ball joint nut - rear left). Sway bar link nut - rear left tightens to 35 ft-lbs, takes a 15mm driver, runs on M10x1.5 threads, located at the sway bar link. The sway bar bushing bracket - front left uses a 13mm drive on a M10x1.5 thread, torqued to 25 ft-lbs at the sway bar bushing. At the strut top mount, the strut mount bolt - front left torques to 50 ft-lbs (18mm drive, M14x2.0 thread). For the shock absorber, plan for a 15mm tool on a M12x1.75 stud; final torque is 45 ft-lbs (shock absorber bolt - upper). Sway bar link nut - rear right tightens to 35 ft-lbs, takes a 15mm driver, runs on M10x1.5 threads, located at the sway bar link. The control arm bolt - rear inner uses a 21mm drive on a M16x2.0 thread, torqued to 125 ft-lbs at the control arm. At the sway bar bushing, the sway bar bushing bracket - front right torques to 25 ft-lbs (13mm drive, M10x1.5 thread). For the leaf spring, plan for a 19mm tool on a M14x2.0 stud; final torque is 90 ft-lbs (leaf spring u-bolt - front right). Leaf spring u-bolt - front left tightens to 90 ft-lbs, takes a 19mm driver, runs on M14x2.0 threads, located at the leaf spring. The control arm bolt - front outer uses a 21mm drive on a M16x2.0 thread, torqued to 125 ft-lbs at the control arm. At the strut top mount, the strut mount bolt - front right torques to 50 ft-lbs (18mm drive, M14x2.0 thread). For the sway bar link, plan for a 15mm tool on a M10x1.5 stud; final torque is 35 ft-lbs (sway bar link nut - front left). Control arm bolt - rear outer tightens to 125 ft-lbs, takes a 21mm driver, runs on M16x2.0 threads, located at the control arm. The ball joint nut - front right uses a 19mm drive on a M14x1.5 thread, torqued to 80 ft-lbs at the ball joint. At the sway bar bushing, the sway bar bushing bracket - rear left torques to 25 ft-lbs (13mm drive, M10x1.5 thread). For the control arm, plan for a 21mm tool on a M16x2.0 stud; final torque is 125 ft-lbs (control arm bolt - front inner). Ball joint nut - front left tightens to 80 ft-lbs, takes a 19mm driver, runs on M14x1.5 threads, located at the ball joint. The strut mount bolt - rear left uses a 18mm drive on a M14x2.0 thread, torqued to 50 ft-lbs at the strut top mount. At the leaf spring, the leaf spring u-bolt - rear right torques to 90 ft-lbs (19mm drive, M14x2.0 thread). For the ball joint, plan for a 19mm tool on a M14x1.5 stud; final torque is 80 ft-lbs (ball joint nut - rear right).

Body — 1998 Ford F 350 Lariat

Body fasteners on the 1998 Ford F 350 Lariat. For the various, plan for a 10mm tool on a M8x1.25 stud; final torque is 15 ft-lbs (miscellaneous fastener 116). Miscellaneous fastener 112 tightens to 15 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the various. The miscellaneous fastener 109 uses a 10mm drive on a M8x1.25 thread, torqued to 15 ft-lbs at the various. At the various, the miscellaneous fastener 114 torques to 15 ft-lbs (10mm drive, M8x1.25 thread). For the various, plan for a 10mm tool on a M8x1.25 stud; final torque is 15 ft-lbs (miscellaneous fastener 115). Miscellaneous fastener 117 tightens to 15 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the various. The miscellaneous fastener 110 uses a 10mm drive on a M8x1.25 thread, torqued to 15 ft-lbs at the various. At the various, the miscellaneous fastener 118 torques to 15 ft-lbs (10mm drive, M8x1.25 thread). For the various, plan for a 10mm tool on a M8x1.25 stud; final torque is 15 ft-lbs (miscellaneous fastener 120). Miscellaneous fastener 111 tightens to 15 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the various. The miscellaneous fastener 113 uses a 10mm drive on a M8x1.25 thread, torqued to 15 ft-lbs at the various. At the various, the miscellaneous fastener 119 torques to 15 ft-lbs (10mm drive, M8x1.25 thread).

Transmission — 1998 Ford F 350 Lariat

Transmission fasteners on the 1998 Ford F 350 Lariat. Bell housing bolt - side tightens to 55 ft-lbs, takes a 15mm driver, runs on M12x1.75 threads, located at the bell housing. The shift linkage bolt - lower uses a 10mm drive on a M8x1.25 thread, torqued to 15 ft-lbs at the shift linkage. At the transmission pan, the transmission pan bolt - right torques to 12 ft-lbs (10mm drive, M8x1.25 thread). For the transmission cooler, plan for a 14mm tool on a M12x1.5 stud; final torque is 20 ft-lbs (cooler line fitting - inlet). Transmission mount bolt - cross member tightens to 65 ft-lbs, takes a 18mm driver, runs on M14x2.0 threads, located at the transmission mount. The shift linkage bolt - pivot uses a 10mm drive on a M8x1.25 thread, torqued to 15 ft-lbs at the shift linkage. At the shift linkage, the shift linkage bolt - upper torques to 15 ft-lbs (10mm drive, M8x1.25 thread). For the transmission pan, plan for a 10mm tool on a M8x1.25 stud; final torque is 12 ft-lbs (transmission pan bolt - front). Cooler line fitting - outlet tightens to 20 ft-lbs, takes a 14mm driver, runs on M12x1.5 threads, located at the transmission cooler. The transmission pan bolt - left uses a 10mm drive on a M8x1.25 thread, torqued to 12 ft-lbs at the transmission pan. At the transmission pan, the transmission pan bolt - corner torques to 12 ft-lbs (10mm drive, M8x1.25 thread). For the transmission mount, plan for a 18mm tool on a M14x2.0 stud; final torque is 65 ft-lbs (transmission mount bolt - rear). Transmission mount bolt - front tightens to 65 ft-lbs, takes a 18mm driver, runs on M14x2.0 threads, located at the transmission mount. The bell housing bolt - lower uses a 15mm drive on a M12x1.75 thread, torqued to 55 ft-lbs at the bell housing. At the transmission pan, the transmission pan bolt - rear torques to 12 ft-lbs (10mm drive, M8x1.25 thread). For the bell housing, plan for a 15mm tool on a M12x1.75 stud; final torque is 55 ft-lbs (bell housing bolt - upper).

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 1998 Ford F 350 Lariat numbers above.

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