Reverse Boost Valve Kit - O-Ring Style
K77898
4L60, 200-4R
Pricing:
$47.05
Description
Large Ratio, O-Ring Style
Vehicles with GM 200-4R and 4L60 transmissions often have problems with poor Reverse boost or upshifts in manual low. These are generally caused by a worn Reverse boost valve sleeve or wear at the pump body. Sonnax offers a larger ratio (.283") Reverse boost valve kit K77898 to restore the hydraulic integrity of the assembly.
Due to the differences in the thermal expansion rate of steel and aluminum when the transmission approaches operating temperature, the sleeve has been allowed excessive clearance and scrubs the bore.
- Sleeve O-rings seal the Reverse boost circuit and prevent leakage from the pump body bore
- Sleeve and valve are made from hardened steel for increased wear resistance
- Sleeve lands have been lengthened to add better sealing and stabilizing capabilities to prevent bore wear
- Reverse boost valve spool lands have been lengthened to aid in maintaining hydraulic integrity
- Drop-in Zip Valve™ parts install quickly and easily
- Valve
- Sleeve
- O-Rings (2)
Symptoms:
- Low Reverse boost
- Delayed Reverse
- Low line pressure
- Poor upshift in manual low
Cause:
Worn Reverse boost valve sleeve or wear at pump body.Correction:
Sonnax large ratio, drop-in Reverse boost valve kit is made from hardened steel and O-rings have been added to seal the Reverse boost circuit and prevent leakage.Details
Shipping Information
- Item Requires Shipping
- 2.0 lbs.
- W4.0000” x H4.0000” x L4.0000”
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