Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Usually a shudder shifting into overdrive like this here can be caused by a fault with the torque converter lock up solenoid itself or an issue with the torque converter itself needing replaced.The lock up solenoid can operate incorrectly causing a shudder feel in some cases and the torque converter as well may not be locking up correctly which causes a shudder.The shudder is usually a slight slip as it is engaging.In some cases having a complete transmission fluid flush done with a flush machine can correct a fault like this here as it will free up and remove debris from the transmission valve body and torque converter while at the same time installing new fluid.The fluid replacement and filter replacement does help but not as well as having the transmission flushed.
If you have not had the fault codes checked yet to see what codes are set this needs done as well.In some cases one or more codes will set that will help diagnosed and pinpoint this cause as well.But one of these here is most commonly the cause needing tested further which can involve a transmission fluid pressure test gauge.
The flush may be something you might have done to see if it resolves the fault here.This requires a transmission flush machine.
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