BMW 328i 328is 1998-1999 Automatic Transmission 4-Speed 4L30E Style-C Remanufactured

Bolt this BMW 4L30E Style-C Remanufactured Transmission straight to your rear-wheel-drive E36 chassis. This four-speed unit restores solid gear engagement across all driving ranges. It fits 1998 to 1999 BMW 328i and 328is sedans and coupes. You must perform a complete transmission cooler flush before running fluid through the unit to maintain pump integrity.

Clean shot-peened A380 aluminum forms both the main case and the forward adapter section. Magnaflux inspections confirm zero cracks around the bellhousing bolt bosses. Inside, fresh steel planet pinions mesh against hardened sun gear teeth with set gear lash. Bushed stator supports and brand-new BorgWarner friction clutch packs handle engine torque without slip. The dry transmission weighs 145 lbs and ships inside a 34 by 22 by 20 inch heavy crate.

Key Features of BMW 4L30E

Independent shops buy BMW 4L30E assemblies to eliminate delayed reverse engagement without paying steep dealership pricing. This commercial remanufactured transmission restores true German road manners for long-distance highway commutes.

- Oversized steel pressure regulator valve stops line pressure loss inside the main pump casting.
- Hardened intermediate brake bands hold the reaction drum tight to prevent second gear flare.
- Hydro-tested aluminum valve body passages sustain twenty-two inches of mercury vacuum during leak tests.
- Balanced remanufactured torque converter eliminates vibration and prevents front pump bushing wear under load.
- BorgWarner friction clutch plates pack into the forward drum for dependable torque transfer.
- New Viton accumulator piston seals resist high heat breakdown during stop-and-go summer traffic.
- Machined stator support bushings guarantee stable fluid feed into the torque converter lockup circuit.

Hydraulic Dyno Bench Telemetry

Every unit mounts to an automated SuperFlow transmission dynamometer for cold and hot run cycles. Technicians log main line pressure at 195 PSI in Drive and 245 PSI in Reverse at 1800 RPM. Electronic pulse-width solenoids show fast actuation rates below thirty milliseconds. Critical valve body bores sustain twenty-one inches of mercury vacuum under static hold. The dyno run confirms zero converter clutch slip under simulated grade resistance. Fluid temperatures reach operating levels of 175 degrees Fahrenheit to expose potential internal seal leakage.

Field Installation Guidelines Limitations

Seat the torque converter with three distinct clicks until the hub clears the bellhousing front face by half an inch. Dowel pins must enter the engine block straight without draw bolt force. Do not buy this factory-spec unit for turbocharged track builds, drift cars, or high-boost engine swaps.

- Flush the chassis transmission fluid cooler with heated solvent to purge ancient friction debris.
- Fill the sump pan with approved Dexron fluid while monitoring pan temperature with diagnostics.
- Reset all transmission adaptation values with a dedicated BMW scan tool before initial road testing.

Warranty Terms Crate Manifest

You receive a nationwide 3-Year/100,000-Mile parts warranty covering internal hydraulic and mechanical failures. The wooden shipping crate contains a balanced torque converter, detailed installation instructions, dynamic test pass sheet, cooler flush verification card, and a pre-printed freight bill of lading for core return pickup.