A604 1998-1999 Chrysler/Dodge/Plymouth Minivans 3.8L FWD – Remanufactured 4-Speed Automatic Trans

Description

Propel 3.8L pushrod V6 engines across steep highway grades and crowded city delivery corridors through 160 PSI hydraulic line pressure and optimized 4-speed transaxle gear reduction. Fleet directors install the Chrysler Plymouth 3.8L A604 Transmission in 1998 to 1999 front-wheel-drive minivans to stop gear slip and preserve vehicle uptime.

High-strength A380 die-cast aluminum casing walls prevent internal gear distortion under high-torque acceleration behind transverse 3.8L engines. Rebuilt valve bodies feature reamed hydraulic bores fitted with hard-anodized Sonnax sleeves to stop cross-channel fluid leakage. Carbon-metallic friction clutch discs with radial oil paths accelerate heat dissipation into fluid circuits. Installation dimensions specify an 8.9-quart ATF+4 fluid sump capacity, standard 5/16-inch inverted flare cooler ports, and an empty dry weight of 172 pounds without torque converter.

Key Features of Chrysler Plymouth 3.8L

Fleet operators buy Chrysler Plymouth 3.8L automatic transmission units to maintain continuous service across shuttle and municipal passenger van fleets. Every remanufactured transaxle integrates updated internal components designed to outperform original factory durability standards under severe transit duty.

• 160 PSI regulated pump pressure holds clutch discs tight under maximum acceleration.
• 4 forward gear ratios provide efficient engine RPM control across city and highway routes.
• Hard-anodized valve bore sleeves eliminate internal hydraulic pressure bypass inside the body.
• High-temperature carbon friction plates withstand thermal stress during continuous stop-and-go driving.
• Balanced lockup torque converters stop driveline shudder during high-speed cruising.
• High-displacement trochoid oil pumps maintain steady fluid volume across elevated temperatures.
• A Chrysler Plymouth 3.8L transmission module utilizes calibrated pulse-width modulated solenoids.
• Reinforced planetary gear pinions resist mechanical wear under repeated throttle inputs.

Hydraulic Limits Gear Ratios

Main line fluid circuits generate 120 to 160 PSI pump pressure to hold clutch packs without slipping under load. Fluid sump temperatures stay within a safe 155°F to 185°F window to prevent fluid shear. The geartrain withstands 240 lb-ft continuous input torque at 3,600 RPM under High-Mileage Transit commercial service standards. Radiator cooler circuits dissipate 22 kW of thermal energy away from rotating components. Gear ratios include 2.84:1 in first gear, 1.57:1 in second gear, 1.00:1 in third gear, and 0.69:1 in overdrive.

Differential CV Axle Interface

Dual differential output hubs feature 26-spline internal broaching that mates straight with factory front CV drive axle stubs. The internal park pawl mechanism holds up to 1,480 lb-ft holding torque to hold passenger vans on steep inclines. Technicians must check axle seal lips and verify bell housing runout within 0.002 inch.

Solenoid Calibration Maintenance Protocol

Pulse-width modulated shift solenoids communicate with the vehicle ECM to regulate fluid pressure and manage shift timing. This transaxle unit is not engineered for track drag strip racing, extreme aftermarket turbo modifications, or commercial trailer towing exceeding vehicle chassis limits.

• Inspect transaxle fluid level and fluid clarity on the dipstick each shift.
• Drain fluid pan and replace the internal pickup filter every 30,000 miles.
• Flush external cooler circuits and verify circuit line pressure every 12 months.

Commercial Fleet Delivery Container

Purchase includes a 3-Year / 100,000-Mile commercial fleet warranty for complete operational peace of mind. The heavy wooden transport container holds the complete remanufactured transaxle, a balanced lockup torque converter, new differential axle seals, an installation manual, and an ATSG dyno verification test sheet with fluid pressure graphs.