740 B230F Transmission removal

The B230F automatic transmission in 740/940 models requires dropping the subframe and engine cradle. Support the engine with a hoist before removing transmission bolts.

Engine hoist with spreader bar, transmission jack, metric socket set, torque wrench, new gaskets and seals, fresh ATF fluid, and jack stands for safety.

The BW55 automatic holds approximately 6.5-7.0 liters total. Refill slowly and check the level when running at operating temperature.

Six bolts (usually 6mm or 8mm) secure the transmission to the engine block. Two lower bolts are accessible from underneath. Always replace bolts if they were stretched during removal.

Transmission rebuild requires specialized tools, hydraulic diagrams, and clean room conditions. Leave internal repairs to a qualified transmission shop. Oil service and seal replacement are doable at home.