Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
There has been a service bulletin for that type of concern. Here is what it states.
Bulletin No.: 02-07-30-039F
Date: July 27, 2005
with 4T65E Transaxle (RPOs MN3, MN7, M15, M76), 4T40E/4T45E Transaxle (RPOs MN4 or MN5) or 4T80E Transaxle (RPO MH1)
with PWM Solenoid Manufacturing Julian Dates Between 219 and 3048
This bulletin is being revised to change the statement of Transmission Release Pressure to Torque Convertor Clutch (TCC) Release Pressure. Please discard Corporate Bulletin Number 02-07-30-039E (Section 07-Transmission/Transaxle).
Some customers may comment that the transmission shifts hard, a shudder/chuggle is felt on deceleration or the Service Engine Soon (SES) light is illuminated.
A technician may find DTC P0742 set.
Customers with 4T80E transaxles may also comment on a "bump" feeling at approximately 61-68 km/h (38-42 mph) when they lift and then tip into the throttle. There may also be a concern of whine noise in 3rd or 4th gear with or without the Service Engine Soon light/message displayed and with DTC P0742 set.
DO NOT REPLACE THE VALVE BODY AND PUMP ASSEMBLY.
Perform one of the following diagnostics:
Replace the TCC PWM solenoid using published procedures for the vehicle being serviced.