Vehicles with Ford AOD transmissions frequently have problems with poor line rise, which results indirect clutch failures and soft shift slides. These complaints are often caused by severe wear of the pressure regulator boost sleeve, allowing oil leakage. The hardened steel boost valve continuously reciprocates within the aluminum boost sleeve, and wears the inside diameter of the sleeve. This excess leakage can be eliminated by installing Sonnax boost valve kit 76990K.

Highly wear-resistant aluminum sleeve prevents wear
O-Rings on sleeve provide positive seal in the casting bore
Steel valve has been tightly toleranced to allow minimum clearance with the inside diameter of the sleeve
Sleeve and valve restore the hydraulic integrity of the assembly
Drop-in Zip Valve™ parts install quickly and easily


Boost Valve Ratios


Part Numbers
Ratios
Great for these Applications

76990K & 76990-03K
.545" Spool Standard Ratio
Standard OE

76990-04K
.553" Spool Large Ratio
Large Ratio OE & High Performance


Learn More About Zip Valve™ Drop-In Repairs

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