BMW Z3 1999-2000 Automatic Transmission 4-Speed 4L30E Remanufactured

Description

Crisp throttle-responsive gear staging and zero shift flare return to your open-top BMW. This remanufactured BMW Z3 4L30E transmission provides exact hydraulic calibration for 1999 to 2000 roadster models. You must flush cooler lines with heated solvent and reset transmission computer adaptives before performing road tests to protect internal clutch pack surfaces.

Shot-peened A380 die-cast aluminum forms both the main case and adapter bellhousing, tested with fluorescent dye penetrant for stress cracks. Forged steel planet pinions endure engine torque without gear teeth pitting or carrier deflection. Rebuilt internals include oversized pressure regulator valves, heavy-duty intermediate bands, Kolene steel plates, and high-energy BorgWarner friction packs. Precision stator support bushings prevent internal fluid leakage. The dry transmission weighs 145 lbs and ships inside a 34 by 22 by 20 inch crate.

Key Features of BMW 4L30E

Technicians buy BMW 4L30E transmission units to eliminate delayed drive engagement without paying steep dealership part pricing. This commercial remanufactured transmission assembly provides dependable power transfer and crisp shifting for your BMW Z3 transmission replacement project.

• Oversized pressure regulator valve sleeve stops hydraulic pressure loss inside the main pump casting.
• Hardened intermediate band provides positive mechanical grip to eliminate second gear shift flare.
• Vacuum testing confirms twenty-two inches of mercury seal across all reamed valve body passages.
• Balanced remanufactured torque converter eliminates driveline vibration and protects front pump bushings.
• BorgWarner friction clutch plates maintain solid torque transfer under continuous highway driving cycles.
• Updated Viton accumulator piston seals prevent fluid cross-leakage during aggressive city driving.
• Precision stator support bushings ensure uninterrupted hydraulic fluid feed to the converter clutch.

AIDCO Bench Dynamometer Pressure Metrics

Technicians test every remanufactured 4L30E gearbox on an automated AIDCO test bench through cold start and elevated operating temperatures. Gauges register main line pressure at 195 PSI in Drive and 245 PSI in Reverse at 1800 RPM. Electronic shift solenoids switch circuits within twenty-four milliseconds without valve hang. Re-machined valve body passages hold twenty-one inches of mercury vacuum during static bench drawdown tests. The test program validates zero torque converter clutch slip at cruising speed. Fluid temperatures hold steady at 175 degrees Fahrenheit.

Field Installation Directives Negative Filter

Spin the torque converter inward through three positive gear drops until the converter clears the front bellhousing face. Check engine block dowels for corrosion before bolting the bellhousing flat to the block. Do not buy this factory calibrated unit for supercharged builds, manual swaps, or track race chassis.

• Flush cooler lines with hot chemical solvent to clear burned friction clutch sediment.
• Fill with approved Dexron III fluid while monitoring sump temperature with diagnostic software.
• Clear transmission adaptation registers using diagnostic software before taking the car on highways.

Nationwide Warranty Freight Crate Contents

Your purchase brings a nationwide 3-Year/100,000-Mile warranty protecting against internal mechanical damage and hydraulic pressure control faults. The sturdy wooden freight crate houses a balanced torque converter, technician installation guide, dynamometer inspection pass slip, cooler flush checklist, and a pre-printed core return bill of lading for simple return transit.