For bores with excessive wear, Sonnax also offers oversized 4-spool switch valve 22771A-13. Both the oversized and standard size Sonnax valves will improve the timing and flow to the apply and release circuits.

• Valve controls TCC release oil venting during apply for a firmer apply and no shudder
• Stem length, spool spacing and exhaust timing have been improved to ensure quicker stroke and less valve bounce
• Drop-in Zip Valve™ installs quickly and easily