SonnaxModulator ValvePart #: S24161

The cast aluminum modulator valve sleeve in the GM 180 and 180C (3L30) cases are known to wear due to continuous stroking of the steel valve. This valve regulates line pressure into modulator pressure and is also controlled by governor pressure. Excess sleeve wear can result in leakage of line, modulator and governor pressures, leading to a multitude of shift complaints and poor line rise. Sonnax modulator sleeve S24161 corrects these issues by restoring hydraulic clearances. Upgraded material resists wear; Drop-in Zip Valve™ installs quickly and easily