1998 Ford F 350 Xl Lug Nut Torque & Bolt Specs

The 1998 Ford F 350 Xl 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 Xl. 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 Xl

Repair guidance for this model year

Heads up for 1998 Ford F 350 Xl 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 Xl?

The OEM-specified lug-nut torque for the 1998 Ford F 350 Xl 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 Xl lug nuts?

The 1998 Ford F 350 Xl 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 Xl 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 Xl years

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

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

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

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

All 121 1998 Ford F 350 Xl fastener specs

Per-bolt torque, wrench size, and thread spec for the 1998 Ford F 350 Xl, 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 Xl

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

Brakes — 1998 Ford F 350 Xl

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

Engine — 1998 Ford F 350 Xl

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

Suspension — 1998 Ford F 350 Xl

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

Body — 1998 Ford F 350 Xl

Body fasteners on the 1998 Ford F 350 Xl. Miscellaneous fastener 118 tightens to 15 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the various. The miscellaneous fastener 115 uses a 10mm drive on a M8x1.25 thread, torqued to 15 ft-lbs at the various. At the various, the miscellaneous fastener 110 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 116). Miscellaneous fastener 111 tightens to 15 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the various. The miscellaneous fastener 119 uses a 10mm drive on a M8x1.25 thread, torqued to 15 ft-lbs at the various. At the various, the miscellaneous fastener 120 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 113). Miscellaneous fastener 109 tightens to 15 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the various. The miscellaneous fastener 112 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 117).

Transmission — 1998 Ford F 350 Xl

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

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