The 2-3 overlap control valve, controlled by EPC (modulated pressure) and shift valve pressure, is used to gradually reduce the pressure to the disengaging K3 clutch, during the 2-3 upshift. The Mercedes 722.6 transmission uses clutch-to-clutch transitioning during shifts, so timing is very critical to prevent shift complaints like flares or bind-ups. Reconditioning the bore and installing Sonnax oversized 2-3 overlap control valve kit 68942-27K restores OE shift pressures for proper timing and function.

Hardcoat anodized aluminum valve has slightly longer critical spool diameters and optimized annular groove placement for better hydraulic sealing and to combat premature wear
Wear-resistant plunger sleeve has an added O-ring to provide additional positive sealing in the bore

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