This expansion ring sits inside the clutch housing, where it applies outward radial force to hold the friction discs and separator plates in their correct stack position. It maintains the preload that keeps the clutch pack engaged when the pedal is released and allows clean disengagement when the pedal is pressed. A ring that has lost its spring tension causes the clutch to slip under load or drag when disengaged, leading to gear clash and premature wear of the friction surfaces. This original-manufacturer ring is formed to the same free diameter and thickness as the original assembly, so it seats fully in the housing groove without requiring shims or additional adjustment. On reinstall, verify the ring is fully seated in its groove before closing the housing.