1998 Ford F 350 Xlt Lug Nut Torque & Bolt Specs

The 1998 Ford F 350 Xlt 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 Xlt. 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 Xlt

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

Heads up for 1998 Ford F 350 Xlt 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

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 1998 Ford F 350 Xlt?

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

The 1998 Ford F 350 Xlt 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 Xlt 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 Xlt years

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

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

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

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

All 121 1998 Ford F 350 Xlt fastener specs

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

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

Brakes — 1998 Ford F 350 Xlt

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

Engine — 1998 Ford F 350 Xlt

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

Suspension — 1998 Ford F 350 Xlt

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

Body — 1998 Ford F 350 Xlt

Body fasteners on the 1998 Ford F 350 Xlt. At the various, the miscellaneous fastener 113 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). Miscellaneous fastener 112 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 109 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 118). Miscellaneous fastener 115 tightens to 15 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the various. The miscellaneous fastener 111 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 110). Miscellaneous fastener 114 tightens to 15 ft-lbs, takes a 10mm driver, runs on M8x1.25 threads, located at the various. The miscellaneous fastener 116 uses a 10mm drive on a M8x1.25 thread, torqued to 15 ft-lbs at the various.

Transmission — 1998 Ford F 350 Xlt

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

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