S5-42 Manual Trans for 1987-1992 F-series 6.9L/7.3L 2WD, 5 Speed, PTO Not In Use

Description

Cast aluminum housing metallurgy absorbs severe structural driveline torque shock while carbon-composite synchronizers handle 420 lb-ft continuous diesel torque during grueling vocational work truck operation in the ZF S5-42 Remanufactured Manual Transmission engineered for 1987 to 1992 Ford F-Series two-wheel drive flatbed chassis powered by 6.9-liter and 7.3-liter diesel engines without PTO use.

The one-piece cast aluminum housing withstands continuous high-load chassis flex across uneven job sites. Precision-machined synchronizer cones receive carbon-composite friction linings to halt gear clash and protect gear teeth. A heavy cast cover seals the side PTO window to prevent oil loss. The unit weighs 175 lbs dry without lubricant. Sump capacity measures 3.4 quarts of synthetic Mercon ATF fluid routed through threaded magnetic drain and fill bungs.

Key Features of ZF S5-42

Fleet operations managers buy ZF S5-42 remanufactured transmission units to restore firm manual gear selection to high-mileage vocational flatbed trucks. Complete factory overhaul procedures eliminate gear grinding and shaft deflection under continuous full gross vehicle payloads.

• Factory-sealed 6-bolt PTO block-off plate stops fluid weeping on non-PTO chassis.
• Carbon-composite synchronizers prevent gear grinding during loaded highway downshifts.
• Induction-hardened helical gearsets absorb 420 lb-ft continuous input diesel torque.
• Upgraded shift detent springs hold shift rails firm to prevent gear pop-out.
• Heavy-duty tapered roller bearings support mainshaft loads under severe tongue weight.
• Precision dial indicator checks hold shaft endplay within strict factory limits.
• Tested ZF S5-42 gear trains provide quiet gear mesh across all speed ranges.
• Viton front and rear oil seals prevent fluid leaks under high operating temperatures.

Mechanical Gear Steps Torque Capacities

The 5-speed manual gear set provides close ratios consisting of 4.14:1 in first, 2.37:1 in second, 1.42:1 in third, 1.00:1 in fourth, and 0.77:1 in fifth gear overdrive. Continuous duty designation supports up to 420 lb-ft continuous input torque at 2,000 RPM. Close ratio spacing maintains diesel engine operation within optimal power bands during highway hill climbs. External housing cooling fins radiate heat to hold lubricant sump temperatures below 180°F under demanding commercial hauling conditions.

Rear Driveshaft Slip Yoke Alignment

A 10-spline 1.25-inch diameter input shaft slides flush into standard diesel clutch friction discs without binding. The two-wheel drive rear output shaft accepts standard driveshaft slip yokes with total dial indicator runout held under 0.002 inches. Tailhousing oil seals resist highway grime and prevent fluid loss onto universal joints.

Manual Shift Transmission Field Guidelines

Inspect clutch hydraulic release cylinder travel to verify complete clutch plate separation prior to vehicle road testing. Replenish the transmission through the side fill bung using synthetic Mercon ATF fluid. This unit is not engineered for closed-course drag strip racing, extreme rock crawling, or gross combined vehicle weights exceeding factory chassis tow limits.

• Inspect casing joints and rear output seals for fluid seepage each shift.
• Drain transmission lubricant and clean magnetic plugs every 30,000 miles.
• Check manual shift lever boot and internal pivot bushings every 12 months.

Commercial Fleet Warranty Transit Manifest

Protected by an industry-leading 3-Year / 100,000-Mile commercial fleet warranty covering certified parts and labor. Each heavy wooden shipping pallet holds one remanufactured manual transmission, sealed PTO cover plate, new throwout bearing, installation manual, and signed rotational bench inspection report.