A618 1991-1993 Dodge D250 D350 5.9L RWD – Remanufactured 4-Speed Automatic Trans

Description

Hydraulic governor activation and 195 PSI line pressure calibrate heavy clutch engagement along high-load highway corridors and severe construction towing routes behind 5.9L Cummins turbo diesel engines. Fleet supervisors install the Dodge A618 Remanufactured Transmission in 1991 to 1993 D250 and D350 rear-wheel-drive trucks to eliminate clutch slip under maximum gross vehicle weights.

A heat-treated A380 die-cast aluminum casing structure counters bell housing deflection behind heavy 5.9L Cummins 12-valve powerplants. The remanufactured cast-iron valve body features reamed bores fitted with hard-anodized Sonnax regulator sleeves to prevent high-pressure internal leaks. Heavy-duty carbon-metallic clutch plates with radial fluid channels disperse intense friction heat under sustained towing. Physical specifications include a 245-pound dry weight without torque converter, an 11.5-quart fluid sump capacity, and standard 3/8-inch inverted flare cooler thread ports.

Key Features of Dodge A618

Commercial operators buy Dodge A618 remanufactured transmission packages to prevent expensive breakdown delays on severe diesel towing and equipment hauling trucks. This remanufactured drivetrain unit features reinforced internal components engineered to outlast original factory specifications under severe commercial truck service.

• 195 PSI regulated line pressure prevents clutch slip under heavy diesel torque output.
• 5-pinion steel front planetary carriers absorb intense driveline shock loads from heavy trailers.
• Hard-anodized valve bore sleeves eliminate internal hydraulic fluid cross-leaks inside the body.
• High-energy carbon friction discs dissipate operational heat to prevent plate glazing.
• Furnace-brazed heavy-duty torque converters prevent stator fin deflection under maximum gross loads.
• High-output fluid pumps maintain steady hydraulic pressure across elevated summer temperatures.
• A Dodge A618 drivetrain package incorporates upgraded hydraulic overdrive engagement solenoids.
• Reinforced direct clutch drums distribute engine torque across six internal friction discs.

Hydraulic Thresholds Diesel Gear Data

Main line fluid circuits regulate between 145 and 195 PSI pump pressure to hold clutch packs firm without slippage under load. Transmission fluid sump temperatures remain within an optimal 160°F to 190°F corridor to safeguard fluid viscosity. The geartrain withstands 450 lb-ft continuous input torque at 1,800 RPM under Severe Commercial Fleet duty cycles. Auxiliary radiator cooler passages shed 32 kW of heat from internal clutch friction discs. Gear ratios measure 2.45:1 in first, 1.45:1 in second, 1.00:1 in third, and 0.69:1 in fourth overdrive.

Rear Driveline Spline Interface

A precision-ground 30-spline rear output shaft mates straight with factory Dodge slip yokes on heavy rear-wheel-drive truck chassis. The internal parking pawl gear provides 1,950 lb-ft holding torque to hold loaded trucks on steep inclines. Technicians must check driveshaft universal joint play and maintain casing extension runout within 0.003-inch total indicator runout.

Diesel Transmission Maintenance Guidelines

Hydraulic governor circuits work in tandem with electronic overdrive solenoids to execute positive gear shifts across varying trailer loads. Note that this heavy commercial transmission is not engineered for track drag strip racing, extreme tractor pull sled competitions, or gross vehicle weights exceeding manufacturer chassis tow ratings.

• Inspect transmission fluid level and fluid condition on the dipstick each shift.
• Drain fluid pan and install new internal pickup filters every 30,000 miles.
• Perform cooler line backflush procedures and test circuit line pressure every 12 months.

Heavy Duty Fleet Warranty Documentation

Every transmission purchase comes backed by a 3-Year / 100,000-Mile commercial fleet warranty for complete operational peace of mind. Shipments arrive in a heavy wooden transport container holding the complete remanufactured transmission, a balanced lockup torque converter, new oil cooler sealing washers, an installation manual, and an ATSG dynamometer test certificate.