Symptoms:
- Soft slide shifts
- Delayed Reverse
- Low line rise
- Direct clutch failure
Cause:
Severe wear of the pressure regulator boost sleeve allows boost oil leakage.Correction:
The Sonnax drop-in kit includes a highly wear-resistant aluminum sleeve to restore hydraulic integrity, and incorporates O-rings to provide positive sealing in the casting bore.AOD
Boost Valve Kit
Part No. 76990K
O-Ring Style
You need this if... View Instructions Find a DistributorVehicles 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 |
O-Ring seals are added insurance against boost oil loss. Sleeve can be installed without these seals, but their use is recommended
- Valve
- Sleeve
- O-Rings (3)
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Ford AOD Valve Body Layout
You need this if...
