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Re: Transmission problem?
You probably have a DTC error code stored related to a bad PCS - Pressure Control solenoid so getting it scanned will retrieve it. These codes do not trigger the SES light but will cause high line pressure which results in the whining sound and harsh shifting.
Sea Foam or Lubegard tranny additive may help so it is worth a try. If that doesn't work then a new PCS solenoid will. A GM TSB has been out on this problem for years now.
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