Hi there,
What you first need to do is have both systems inspected to see which part is at fault, normally it will be a sensor and a solenoid, the prices will vary depending on if you get genuine or after market, bet you get a few quotes from transmission specialist, but don't be surprised if they will require an inspection first, to prove the diagnosis.
Mark (mhpautos)
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Friday, September 11th, 2009 AT 8:48 PM