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 and sleeve kit 54200-06K 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"|
Large boost ratio kit. Please see chart to verify.