BMW 3 Series, X3, Z4 Driveshaft Flex Disc Kit Bush

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BMW 3 Series, X3, Z4 Driveshaft Flex Disc Kit Bush

OE Numbers:
33321136311 33326771828
Vehicle Application:
639/906A207C218
Imported BMW 3 Series, X3, Z4

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The BMW 3 Series, X3, and Z4 Driveshaft Flex Disc Kit Bush is a key flexible connection component in the driveshaft system of imported BMW 3 Series, X3, and Z4 models. It is specifically designed for use with the driveshaft flex disc and, together with the LJ-729, forms a complete chassis repair kit. The driveshaft flex disc bushing is installed at the connection between the driveshaft and the transmission output or rear differential input. Its core function is to absorb the torsional impact and slight angular deviations generated during high-speed rotation of the driveshaft through the rubber elastomer, preventing vibrations from the drivetrain from being directly transmitted to the passenger compartment as solid-borne noise. It also compensates for minor displacements and misalignments caused by the engine and transmission under different operating conditions, ensuring a smooth and continuous powertrain transmission. This part operates in a special environment, requiring long-term stable operation under high speed, high torque, and continuous vibration conditions, placing extremely high demands on the heat resistance, fatigue resistance, and torsional resistance of the rubber material.

Special Transmission Dimensions: A specially designed 49mm outer diameter and 57mm length to fit the geometric constraints of the floppy disk mounting flanges on BMW 3 Series, X3, and Z4 platforms.
Precision Inner Diameter Fit: A 12mm inner diameter with strictly controlled precision ensures a tight fit with the floppy disk fixing bolts, preventing loosening or wobbling under high-speed centrifugal force and torque impact.
Anti-Torsion Rubber Compound: Specifically designed to address the high-frequency torsional load characteristics of driveshafts, the rubber compound is specially balanced between circumferential shear stiffness and axial compressive elasticity.
Kit-Style Supply Design: When used in conjunction with LJ-729, this product covers the complete chassis repair needs of this vehicle model, reducing the risk of size mismatches caused by multiple purchases.

Functional Dimension: The LJ-770's flexible soft-disk bushing functions as a "vibration damping throttle" for the transmission system. By continuously absorbing and smoothly transmitting torsional impacts from the driveshaft, it significantly reduces low-frequency humming noise and transmission jerking, particularly noticeable in imported BMW 3 Series and X3 models experiencing transmission vibrations during idle start-up. Its slight angular deviation compensation capability also effectively slows down the wear rate of surrounding transmission components.

Durability Dimension: Driveshaft soft-disk bushings are subjected to high speeds, high temperatures, and grease environments. LJ-770 uses a special transmission rubber compound that is resistant to high temperatures and grease corrosion, maintaining its elasticity for a long time within the normal operating temperature range of the transmission system. Torsional fatigue testing verifies its stable cycle life under continuous high-frequency torsional loads. Used in conjunction with LJ-729, it avoids secondary repairs due to individual component failures, extending the overall maintenance cycle of the transmission system.

Compatibility: Adapts to the transmission floppy disk nodes of multiple mainstream models such as the BMW 3 Series (639/906A207C218 platform), X3, and Z4, with dual OEM number coverage for easy matching; kit-based supply combined with LJ-729 allows for simultaneous repair of chassis-related nodes in one go, reducing repair time; suitable for professional chassis repair institutions and imported BMW authorized repair shops to purchase in bulk for backup.

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Anhui Lianjun Rubber Technology Co., LTD., formerly Wenzhou Lianjun Vehicle Parts Co., LTD., was founded in 2009, referred to as "Lianjun Rubber". Lianjun Rubber is located in Ningguo city, Anhui province—automobile NVH rubber damper production base, the factory covers an area of 13,000 square meters, close to Hangzhou city (less than 100km).Lianjun Rubber focusing on NVH rubber damper elements of R&D, manufacturing and sales for Mercedes-Benz and BMW chassis systems. Its main products are Engine mounts, Drive shaft support bearing, Transmission mounts, Support drive shaft, Sturt mounts, Bushing and other series of auto rubber material products, nearly 1000 specifications. Lianjun Rubber is committed...
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