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There are only 2 shifting solenoids in the 4L80-E Transmission. To go into 4th Gear both of those shifting solenoids have to engage and allow fluid to go to the TCC Solenoid. This solenoid is regulated by the computer to put you into overdrive and it does. The problem can more than likely be traced to the TCC Regulator valve that the TCC solenoid controls.
The Basics of this TCC Solenoid simply turn on and turn off "pulsed" pressure to the Torque converter clutch. the achilles heel of this transmission is this valve that can wear out. This is why when the fluid is cold the Overdrive works OK. When its warm then fluid can slip on by. |
RV and bus conversion info since 1996.
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