S6-750F Manual Trans for Ford 2003-2007 F-series 6.0L 2WD, 6 Speed

Description

Propel loaded 6.0-liter diesel commercial Super Duty chassis cab trucks up steep highway mountain grades under 560 lb-ft input torque without gear step hesitation through the ZF S6-750 Remanufactured Manual Transmission engineered for 2003 to 2007 Ford F-Series two-wheel drive work trucks powered by the 6.0-liter Powerstroke diesel powertrain in severe commercial service.

Heavy-wall cast aluminum housing architecture incorporates an internal fluid pump that circulates transmission fluid through external cooling circuits under pressure. Synchronizer packs feature carbon-composite linings on all forward speeds to prevent gear clash. Hardened countershafts and cluster gears transfer extreme low-end diesel torque. Bare dry unit weight registers 230 lbs without lubricant. Sump capacity requires 5.8 quarts of synthetic Mercon ATF fluid circulating past integrated cooler ports and magnetic inspection plugs.

Key Features of ZF S6-750

Severe duty commercial fleet managers choose to buy ZF S6-750 remanufactured transmission units to handle extreme gross combined vehicle weights behind turbocharged diesel engines. Comprehensive rebuilding protocols replace all internal pump components, synchronizers, and bearings to deliver reliable commercial performance.

• Internal trochoid oil pump circulates ATF to external front cooler cores under load.
• Carbon-composite synchronizers prevent gear grinding across all six forward speed selections.
• Massive helical cluster gears absorb 560 lb-ft continuous input diesel torque.
• Hardened shift rails and detent springs stop transmission jumping out of gear.
• High-capacity tapered roller bearings maintain mainshaft endplay under severe tongue weight.
• Integrated bell housing bolts straight to Ford 6.0L Powerstroke diesel engine block adapters.
• Remanufactured ZF S6-750 gearsets undergo dynamic spin checks to verify silent gear mesh.
• Viton front and rear oil seals withstand continuous 250°F operating spikes.

Six-Speed Gear Ratios Torque Capacity

The 6-speed manual gear train provides mechanical reduction steps of 5.79:1 in low crawler gear, 3.30:1 in first, 2.10:1 in second, 1.30:1 in third, 1.00:1 in fourth, and 0.72:1 in fifth overdrive. Continuous duty designation supports up to 560 lb-ft continuous input torque at 2,000 RPM. The internal mechanical pump channels 120 PSI fluid pressure across external heat exchangers to maintain sump temperatures below 175°F under severe 20,000-lb gross combined towing loads.

Two-Wheel Drive Diesel Spline Alignment

A massive 10-spline 1.375-inch diameter input shaft seats into standard dual-mass diesel clutch discs without spline hang-up. The two-wheel drive rear output shaft links straight to chassis driveshafts with dial indicator runout held below 0.002 inches. Heavy-duty rear extension housing bearings support driveshaft weight without deflection.

Diesel Six-Speed Transmission Field Standards

Flush and flow-test external transmission cooler lines prior to transmission installation to prevent pump cavitation. Fill the unit through the side check port using synthetic Mercon ATF fluid until oil reaches the threads. 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 external cooler line connections and casing seams for fluid leaks each shift.
• Drain transmission fluid, clean magnetic plugs, and flush cooler lines every 30,000 miles.
• Check manual transmission mount bushings and crossmember bolts every 12 months.

Commercial Six-Speed Transit Crate Manifest

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 six-speed manual transmission, new clutch release bearing, cooler line sealing washers, installation manual, and signed rotational inspection report.