Hi f.E. Galvez,
Depending on which model trans you have, the number of solenoids varies. Any faulty solenoid can cause erractic or harsh shiftings.
Normally if any solenoid is malfunctioning, the D4 light should be blinking while driving.
Get a scan done to retrieve Diagnostic Trouble Codes.
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Friday, December 5th, 2008 AT 9:45 AM