In GM 4L30-E, AR25 and AR35 units, the OE boost valves are made of steel, whereas the sleeves are made out of aluminum. Over time the valve wears against the sleeve and causes boost pressure leakage. The result is low line pressure during boost, with associated burnt clutches. Sonnax boost valve kit 54200-14K restores pressure control to the boost circuit.
|Sonnax Part No.||Boost Ratio||Sonnax I.D. Mark||OE/Euro I.D. Mark||Large Spool Diameter||Small Spool Diameter|
|54200-14K||Small to Medium||067||067||.634"||.570"|
Small/Medium boost ratio kit. Please see chart to verify.