5R110W 2008 Ford F-250-F-550 Super Duty 6.4L RWD and AWD/4WD – Remanufactured 5-Speed Automatic Trans

Description

Constructed for severe-duty commercial platforms, this Ford F-450 Super Duty 2008 Remanufactured Transmission channels 6.4L twin-turbo Powerstroke diesel torque across all 4 wheels. The 5-Speed 4WD platform supports 350 horsepower and 650 lb-ft of torque beneath a 3,800 RPM redline. Operating mainline hydraulic line pressure sustains 250 PSI to clamp friction plates firm during heavy commercial hauling.

Heavy-ribbed die-cast aluminum casing protects high-strength 8620 carburized planetary gear clusters built for extreme shear resistance. Segmented graphite friction plates pair with thick nitrided steel reaction plates for optimal heat handling. The updated valve body integrates precision bore sleeves and an oversized pressure regulator valve assembly. Complete dry unit weight reaches 270 lbs, with an 18.5-quart fluid sump capacity and 1/2-inch inverted flare external oil lines.

Key Features of Ford F-450

Commercial trucking companies buy Ford F-450 Super Duty 2008 remanufactured transmission units to cure torque converter clutch shudder and gear slipping in 1-ton and medium-duty diesel work trucks. Each rebuilt unit contains upgraded heavy-duty clutch packs engineered to cope with severe commercial towing demands.

• 31-spline turbine input shaft withstands high rotational twisting forces from the twin-turbo diesel engine.
• F-450 2008 replacement valve body prevents pressure drops in forward drive clutches.
• 5-Speed gear set provides effortless acceleration through a wide ratio spread ending in overdrive.
• Hardened steel planetary carriers handle massive torque without pin deflection or gear whine.
• 2008 F-450 torque converter package utilizes furnace-brazed turbine fins for extra durability.
• Heavy-duty friction linings reject high heat buildup during heavy equipment transport runs.
• Upgraded electronic shift solenoids maintain precise gear transition timing in all driving modes.

Twin Turbo Diesel Line Pressures

Internal line pressures cycle smoothly from 195 to 250 PSI through electronic pulse-width modulated solenoids. Operating fluid temperature hovers between 170°F and 195°F under continuous heavy towing cruise conditions. Gear reduction steps begin at 3.11:1 in 1st gear, progressing to direct 1.00:1 in 4th gear, and concluding at 0.71:1 in 5th gear overdrive. The high-capacity cooling circuit maintains fluid stability across demanding mountain passes.

Four Wheel Driveline Coupling Protocol

The transmission rear extension housing contains a 31-spline output shaft engineered to couple straight to the transfer case input. Tailshaft radial runout measures under 0.0016 inches on calibrated dial indicators. The structural crossmember mounting pad sits 29.8 inches back from the front bell housing face. A precision pilot register ensures centered alignment to eliminate driveline resonance throughout the vehicle cab.

Severe Load Dyno Testing

Every gearbox runs on an automated load dynamometer using warm test oil to evaluate line pressure holding and clutch engagement times. This transmission is not engineered for competition sled pulling, oversized injector tuning, or vehicles retaining dirty transmission oil coolers.

• Examine fluid levels via the dipstick tube every 30 operating days.
• Drain fluid, clean magnetic pan, and replace external filter every 30,000 miles.
• Inspect transmission support crossmember bushings and transfer case seal every 12 months.

Diesel Fleet Crate Package

Each unit ships protected by a comprehensive 3-Year unlimited mileage warranty. The sealed wood crate contains the remanufactured 5-Speed transmission, dyno-verified torque converter, external fluid filter element, and fluid specification tags outlining OEM fluid requirements.