Symptoms:
- Low line pressure
- Burnt clutches
- Soft upshifts
- Delayed Reverse
Cause:
Leakage between the boost valve and sleeve.Correction:
Sonnax drop-in boost valve kits are available in three different ratios to restore pressure control in most OE applications.4L30-E, AR25, AR35
Boost Valve Kit
Part No. 54200-01K
Medium ratio, OE code 448
View Instructions Find a DistributorIn 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" |
Medium boost ratio kit. Please see chart to verify.
- Valve
- Sleeve
