F4A4B-4 2004-2006 Mitsubishi Lancer 2.4L FWD – Remanufactured 4-Speed Automatic Trans

Description

Propel loaded 2.4-liter fleet passenger sedans up steep highway mountain grades under 230 PSI hydraulic line force without forward gear step hesitation through the Mitsubishi F4A4B-4 Remanufactured Automatic Transmission engineered for 2004 to 2006 Mitsubishi Lancer front-wheel-drive models carrying the 2.4-liter engine.

Cast A380 aluminum casings maintain tight shaft centerline tolerances under heavy acceleration while maintaining 176 lbs dry weight without fluid. Remanufactured valve bodies receive oversized hard-anodized pressure regulator bore sleeves that stop internal fluid circuit bypass. The transaxle features threaded 3/8-inch cooler union connections, a factory 4-bolt torque converter drive pattern, and an 8.2-quart fluid sump capacity.

Key Features of Mitsubishi F4A4B-4

Professional automotive fleet technicians choose to buy Mitsubishi F4A4B-4 remanufactured transmission units to restore positive forward gear engagement. Automated dyno tests verify line pressure rise, clutch pack clearances, and solenoid actuation response under load.

• 225 PSI main hydraulic pressure sustains firm forward clutch engagement across elevated load conditions
• Sintered bronze reaction plates dissipate thermal spikes under stop-and-go municipal driving cycles
• Case-hardened planetary carrier pins resist pin walk under repetitive forward throttle applications
• Dynamic fluid dyno runs test shift solenoid pulse sequences across simulated road speeds
• Precision-lathed torque converter impeller hubs guarantee concentric fitment against the front pump gear
• Shot-peened gear tooth profiles absorb cyclic shock loads without surface pitting or micro-fracturing
• Calibrated F4A4B-4 transmission fluid temperature sensors communicate continuous sump metrics to the vehicle computer
• Removable steel fluid pan provides direct access to internal magnet positions for simplified maintenance

Dynamic Torque Transfer Hydraulic Range

Operating hydraulic pressure spans from 66 PSI baseline up to 228 PSI under heavy throttle inputs. Fluid sump temperatures hold stable within the 165°F to 188°F operating window under sustained vehicle motion. Continuous input torque ratings reach 215 lb-ft at 4,200 RPM during severe municipal fleet operation. Integrated cooler loops direct thermal dissipation rates above 13.5 kW. Gear reduction ratios span 2.842:1 first, 1.529:1 second, 1.000:1 third, and a fuel-conserving 0.731:1 overdrive fourth gear ratio.

Axle Spline Differential Carrier Interface

Differential side gears utilize 25-spline internal teeth that match factory constant velocity half-shafts. Case runout across the differential carrier bearings is measured to less than 0.0018 inches to prevent front axle seal leaks. The hardened steel parking sprag mechanism holds up to 1,550 lb-ft of vehicle curb weight roll torque on steep street grades.

Transmission Control Adaptation Service Rules

Technicians must erase old transmission control shift points and run a 15-minute steady throttle cycle before vehicle release. This drivetrain component is not engineered for off-road rock crawling, extreme vehicle curb jumping, or vehicles modified with nitrous oxide injection.

• Perform fluid level dipstick inspections with engine idling in neutral each shift
• Flush external transaxle cooler circuits every 30,000 miles to clear trapped debris
• Renew internal transmission fluid every 12 months using approved SP-III fluid formulations

Fleet Warranty Documented Crate Shipment

Backed by an ironclad 3-Year / 100,000-Mile commercial fleet warranty covering remanufactured parts and labor. Each wooden shipping crate holds the complete remanufactured transaxle, factory-balanced torque converter, replacement cooler copper washers, setup checklist sheet, and documented dyno inspection records.