Too much oil to the bypass control valve plunger, or wear at the control sleeve.
The smaller orifice in the Sonnax sleeve allows TCC oil to stroke the bypass valve more quickly. The improved plunger and sleeve replace worn components that are leaking converter charge oil to exhaust.
Common complaints with AODE/4R70W/4R75W transmissions include delayed lockup, shudder, no lockup or converter codes. When too much oil is routed to this plunger valve, the bypass valve has slow reaction from MCC/TCC solenoid oil. If there is excessive wear at the plunger valve, regulated converter charge oil can leak to exhaust. Because this regulated converter charge oil is always present, either as release or apply pressure, severe leakage at the sleeve can result in TCC slip or no apply condition. Sonnax offers a replacement bypass clutch control sleeve and plunger valve with a restricted oil flow orifice, 76948-04K.
November 14, 2016
Topics: Vacuum Test Guides Vacuum Testing Transmission Ford 4R75W Transmission 4R70W Transmission AODE Transmission 4R70E Transmission 4R75E TransmissionRead Now
September 30, 2005
Topics: Diagnostics And Theory TransmissionRead Now
Contact a Sonnax Parts Distributor.