S5-42 Manual Trans for 1987-1995 F-series 6.9L/7.3L 4×4, 5 Speed, PTO Not In Use

Description

Propel loaded 7.3-liter diesel four-wheel drive work truck chassis through deep mud and steep grade inclines under 420 lb-ft input torque without gear slip through the ZF S5-42 Remanufactured Manual Transmission engineered for 1987 to 1995 Ford F-Series four-wheel drive trucks powered by 6.9-liter and 7.3-liter diesel engines without PTO accessories.

One-piece cast aluminum housing architecture provides high torsional stiffness to withstand severe four-wheel drive transfer case reaction forces. Multi-cone brass and carbon synchronizers halt gear clash during low-range off-road shifting. A heavy 6-bolt cast block-off cover seals the side PTO window against moisture and fluid weeping. Dry package weight registers 175 lbs. Fluid capacity holds 3.4 quarts of synthetic Mercon ATF fluid circulating past magnetic inspection plugs.

Key Features of ZF S5-42

Four-wheel drive fleet operators choose to buy ZF S5-42 remanufactured transmission units to eliminate gear jumping and bearing failure in severe off-road work environments. Specialized remanufacturing brings all internal clearances back to original factory specifications for dependable commercial operation.

• Sealed 6-bolt PTO block-off plate prevents fluid leaks on non-PTO four-wheel drive trucks.
• Carbon-composite synchronizers prevent gear clash during low-range transfer case engagement.
• Massive helical cluster gears absorb 420 lb-ft continuous input diesel torque.
• Hardened shift rails and detent springs stop transmission jumping out of gear.
• High-capacity tapered roller bearings hold shaft endplay within strict factory limits.
• Four-wheel drive adapter housing bolts straight to BorgWarner 1356 transfer cases.
• Tested ZF S5-42 gearsets guarantee quiet gear mesh across all speed ranges.
• High-temp Viton transfer case adapter seals prevent cross-fluid contamination.

Four-Wheel Drive Reduction Torque Thresholds

The 5-speed manual gear set provides wide ratios featuring 5.72:1 in first, 2.94:1 in second, 1.61:1 in third, 1.00:1 in fourth, and 0.76:1 in fifth gear overdrive. Continuous duty designation supports up to 420 lb-ft continuous input torque at 2,000 RPM. The ultra-low 5.72:1 first gear provides crawl capability across steep rock and mud job sites. External housing cooling fins radiate heat to hold lubricant sump temperatures below 180°F under heavy gross combined vehicle weights.

Transfer Case Spline Interface Parameters

A 10-spline 1.25-inch diameter input shaft slides flush into standard diesel clutch plates without binding. The four-wheel drive 31-spline output shaft interfaces straight with transfer case input hubs. Centerline shaft runout measures under 0.002 inches on dial indicators to protect transfer case input bearings from premature failure during heavy torque transfers.

Off-Road Manual Transmission Field Standards

Check clutch hydraulic master and slave cylinder stroke to ensure complete clutch plate disengagement before initial road testing. Fill the transmission case using synthetic Mercon ATF fluid through the side check port. 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 transfer case adapter housing seals for fluid seepage each shift.
• Drain transmission fluid, clean magnetic drain bungs, and refill every 30,000 miles.
• Inspect four-wheel drive shifter linkage bushings and crossmember bolts every 12 months.

Four-Wheel Drive Crate Warranty Terms

Protected by an industry-leading 3-Year / 100,000-Mile commercial fleet warranty covering certified parts and labor. Each heavy wooden shipping crate contains one remanufactured manual transmission, sealed PTO block-off plate, new throwout bearing, transfer case gasket, installation manual, and signed rotational inspection report.