Enhance Your BMW's LSD Performance with Racing Diffs Preload Shims A frequent issue with ZF Limited Slip Differentials in BMW models such as the E30, E36, and E34 is the loosening or damage of preload shims (Belleville washers) due to overheating. To maintain optimal performance and reliability, it is essential to replace these shims during an LSD rebuild. Why Choose Racing Diffs Preload Shims? Superior Strength: Our preload shims are 30% stronger than the originals, providing significantly improved LSD performance with better lock and traction. Enhanced Durability: Extra hardened to 55 HRC, these shims offer greater longevity and enhanced performance under extreme conditions. Comprehensive Solution: While replacing the preload shims, we also recommend changing the clutch plates, as they are often the primary cause of differential overheating. Key Features: Improved Performance: Higher preload ensures better locking and traction, making your BMW handle better in all driving conditions. Durable Construction: Made to withstand high temperatures and stresses, ensuring your differential remains reliable for longer. Multiple Sizes: Available in three different sizes (168mm, 188mm and 210mm) to fit various BMW models. Not sure about the best fit? Simply send us your VIN, and we will confirm the correct size for your vehicle. Compatibility Note: The 210mm preload shims do not fit GKN differentials found in E46, E92, E60, E63, and Z4 M models. For free play solutions, explore our LSD Clutch Pack + Free Play Delete Kits for models like M3, M5, M6, and Z4M. Maintain and Upgrade Your Differential: Regular maintenance and the right upgrades can significantly enhance your BMW's driving experience. Trust Racing Diffs for high-quality differential components that keep your vehicle performing at its best.