Aisin AW 55-50SN transmissions may exhibit multiple shift problems due to excessive wear in the solenoid modulator circuit. Loss of 3rd, 4th or 5th gear and no TCC apply are common along with low line pressure and flare shifts. Bore wear at the inboard end results in high solenoid pressure, improper gear or harsh shifts. The Sonnax oversized solenoid modulator valve kit 59947-34K allows the bore to be refurbished, and the hydraulic integrity restored for proper modulated solenoid pressure.
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.
December 22, 2014
Topics: Diagnostics And Theory Shop Practices Rebuilding Tips Vacuum Testing Transmission GM Aisin AW 4L60-E Transmission 55-50SN TransmissionRead Now
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A Wet Air Test in thelocation indicated with the valve blocked inward results in leakage out the neighboring line port, or a vacuum test fails to hold a minimum of 18 in-hg