Understanding BMW Automatic Transmissions

This document provides an in-depth look at BMW's automatic transmission systems. It covers the evolution from hydraulic to electro-hydraulic controls, explaining the role of the Transmission Control Module (TCM) and its adaptive capabilities. Discover the different manufacturers of BMW automatic transmissions, including ZF and GM Powertrain, and how to decipher BMW's unique transmission identification codes.

Key Components and Systems

Explore the critical components of automatic transmissions, such as the torque converter, its impeller, turbine, and stator, and how they facilitate smooth power transfer. The document details the operation of the torque converter at both low and high speeds, including the function of the torque converter clutch (TCC) for enhanced fuel efficiency. It also explains the different types of oil pumps used, the crescent type and the vane type, and their mechanisms for regulating oil volume.

Transmission Fluids and Maintenance

Learn about the importance of using the correct transmission fluid, as specified by BMW, to prevent damage and ensure optimal performance. The guide outlines various transmission fluid types and their corresponding BMW part numbers for different models, emphasizing the 'lifetime fill' concept for many modern transmissions and the procedures for fluid handling during repairs.

For detailed information on specific transmission models and their identification, refer to the provided diagrams and tables within the full document.

	BMW Transmission Shafts and Tightening Torque Specifications Comprehensive technical data, including axial play and radial runout specifications, along with detailed tightening torque values for various BMW transmission shafts and related components. Covers multiple transmission models and vehicle series.
	BMW Automatic Transmission Servicing Guide: 1997-2005 Models Comprehensive servicing guide for 1997-2005 BMW automatic transmissions, focusing on A5S 325Z and A5S 360R/390R models. Includes application charts, identification codes, fluid recommendations, and adjustment procedures for vehicles like the BMW X5, 3-Series, and Z4.
	BMW Manual Transmission Service: GS6-37BZ & S5D 280Z/S5D 320Z (2001-2005) Comprehensive service guide for BMW GS6-37BZ and S5D 280Z/S5D 320Z manual transmissions (2001-2005), covering lubrication, fluid types, removal, installation, and torque specifications for models like the E53 X5.
	BMW Service Bulletin 24 03 08: E9x/E6x Automatic Transmission Jolt and Delay Technical service information bulletin from BMW addressing jolt and delay issues in E9x and E6x models with 6HP19TU automatic transmissions, including solutions and warranty details.
	BMW X5 (2000-2003) M62 Engine Technical Specifications Detailed technical specifications for BMW X5 vehicles (2000-2003) featuring M62 engines (M62 B35, M62 B44, M62 B46). Covers engine general data, block, head, crankshaft, bearings, valves, oil pump, vibration damper, connecting rods, pistons, camshafts, and fan specifications.
	BMW N20/N26 Timing and Oil Pump Drive Chain Diagnosis and Repair Class Action Settlement Information regarding the BMW N20/N26 class action settlement for timing and oil pump drive chain diagnosis and repair, including eligible vehicles, procedures, and claim information.
	BMW Safety Recall 23V-821: Transmission Mechatronics Replacement This document provides details on BMW Safety Recall 23V-821 concerning the replacement of transmission mechatronics in certain Model Year 2023 BMW vehicles due to potential issues with the Integrated Transmission Control Unit (ITCU).
	2000-2004 BMW X5 Power Window System: Operation and Service Guide Comprehensive guide to the 2000-2004 BMW X5 power window system, detailing operation, features like anti-trap protection, and step-by-step removal and installation procedures for components such as window regulators, switches, and door panels.

Understanding BMW Automatic Transmissions

Key Components and Systems

Transmission Fluids and Maintenance

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