S5-42 Manual Trans for 1987-1995 F-series 6.9L/7.3L, 5 Speed, PTO In Use

Description

Eliminate manual gear clash and internal bearing whine under 420 lb-ft continuous diesel torque across severe regional commercial heavy hauling corridors with the ZF S5-42 Remanufactured Manual Transmission engineered for 1987 to 1995 Ford F-Series work trucks equipped with 6.9-liter and 7.3-liter diesel engines utilizing active PTO systems.

Cast aluminum housing construction provides structural containment to prevent shaft deflection under high diesel torque loads. High-wear brass and carbon synchronizers halt gear clash during heavy trailer towing cycles. The side SAE 6-bolt PTO aperture contains drive gear teeth ready for auxiliary hydraulic pump engagement. Bare dry unit weight registers 175 lbs without lubricant. Fluid capacity requires 3.4 quarts of synthetic Mercon ATF fluid circulating past magnetic drain and fill bungs.

Key Features of ZF S5-42

Municipal utility supervisors choose to buy ZF S5-42 remanufactured transmission units to restore PTO functionality to public works dump trucks and service bodies. Comprehensive rebuilding processes restore shift rail tolerances to eliminate chronic gear jump-out during loaded operations.

• Open 6-bolt PTO window allows direct attachment of commercial hydraulic pumps.
• Heavy-duty synchronizer rings stop gear clash between first and second gears.
• Induction-hardened gear teeth absorb 420 lb-ft continuous input diesel torque.
• Refurbished shift selector rails provide crisp detent feel across all gates.
• Premium Timken tapered bearings support cluster shafts under severe thrust loads.
• Integrated bell housing bolts straight to Ford diesel engine block adapter plates.
• Tested ZF S5-42 gear clusters prevent rotational gear chatter at low engine idle.
• High-temperature Viton shaft seals stop fluid loss during long highway hauling trips.

PTO Gear Ratio Step Multiplication

The 5-speed manual gear train incorporates reduction ratios 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. Auxiliary PTO drive gears transfer 100 percent engine rotational speed to power winches and hydraulic dumps. External casing ribs facilitate rapid heat radiation to maintain lubricant temperatures below 180°F under high-mileage highway operation.

Driveline Spline Interface Input Alignment

A 10-spline 1.25-inch diameter input shaft mates with standard 12-inch diesel clutch friction discs without binding. The rear output shaft interfaces straight with driveshaft slip yokes or four-wheel drive transfer case hubs. Dial indicator measurements confirm shaft runout under 0.002 inches to eliminate driveline vibration and protect rear oil seals.

PTO Auxiliary Operation Service Standards

Verify PTO drive gear backlash and torque mounting fasteners to factory specifications before operating auxiliary hydraulic pumps. Fill the unit through the side plug 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 PTO mounting gaskets and hydraulic pump flanges for fluid weeping each shift.
• Drain transmission fluid and wipe clean magnetic drain bungs every 30,000 miles.
• Check manual clutch linkage rod bushings and pedal free play every 12 months.

Fleet Warranty Statement Shipping Manifest

Backed by a 3-Year / 100,000-Mile commercial fleet warranty covering internal parts and certified labor. Each heavy wooden shipping crate contains one remanufactured manual transmission, PTO aperture gasket, new release bearing, installation technical manual, and signed dynamometer spin test report.