In Mercedes 722.6 units, excessive valve-to-bore clearance at the modulating pressure area allows modulated solenoid feed pressure to exhaust, reducing line pressure and creating shift-related complaints. Bore wear at the inner spool results in high line pressure conditions. Sonnax oversized pressure regulator valve kit 68942-07K salvages the valve body with an oversized hardcoat anodized valve and recalibrated springs.

Outer spool has extended length for better support
Hardcoat anodized aluminum valve combats premature wear
Valve spools have annular grooves to prevent future side-load wear

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