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 54200-01K restores pressure control to the boost circuit.

Sleeve is made from wear-resistant aluminum and incorporates annular oil passages to distribute boost oil evenly to the valve and reduce side loading
Hardcoat anodized aluminum valve combats premature wear
Valve includes oil grooves which allows the valve to ride on a film of oil, further reducing wear
Valve and sleeve are made from the same material to help reduce leakage due to thermal expansion
Drop-in Zip Valve™ parts install quickly and easily


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"

54200-01K
Medium
M
448
.662"
.630"

54200-06K
Large
L
264
.697"
.649"


Learn More About Zip Valve™ Drop-In Repairs

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