Boost Valve Kit Sonnax (Medium Ratio) 4L30E ML4

Boost Valve Kit for 4L30-E Medium Ratio, OE Code 448 In GM 4L30-E units, the original equipment (OE) boost valves are constructed from steel, while the sleeves are crafted from aluminum. As time passes, the valve grinds against the sleeve, leading to boost pressure leakage. This wear and tear results in reduced line pressure during boost, often culminating in burnt clutches. The Sonnax boost valve 54200-01K is designed to re-establish precise control over the boost circuit. The sleeve is fabricated from wear-resistant aluminum and features annular oil passages. These passages ensure even distribution of boost oil to the valve and minimize side loading. The valve is made of hardcoat anodized aluminum, effectively resisting premature wear. Integrated oil grooves in the valve allow it to glide on a film of oil, further diminishing wear. Both the valve and sleeve are composed of identical materials, a design choice that mitigates leakage caused by thermal expansion. Drop-in Zip Valve™ com