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:
Sonnax drop-in boost valve kit is made from special aluminum to prevent wear.AOD
Boost Valve Kit
Part No. 76990-04K
Large Ratio, Factory-Style Sleeve, No O-Rings
You need this if... View Instructions Find a DistributorWhen rebuilding high performance or heavy-duty Ford AOD units, many rebuilders wish to increase line rise over the OE specifications. This is now easily accomplished by installing Sonnax large ratio boost valve kit 76990-04K. Not only will our sleeve and valve kit address poor line rise, direct clutch failure and soft slide shift complaints due to the OE sleeve being worn, but is now available in a larger boost ratio.
- Large ratio boost sleeve is made from a highly wear-resistant aluminum and comes without O-rings for ease of installation
- Steel valve has been tightly toleranced for minimal leakage and extended life
- 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 |
- Valve
- Sleeve
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...
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.
