Matthew Jeschke
Full Access Member
I have the 3800cc w/ 4T65-E transmission. It's a 2006 Buick Lucerne (same as impala). This issue has been going on for some time. I always attributed it to a goofy Transmission control algorithm but think it might be more now.
The transmission develops a very harsh shift after driving at slow speeds. Most always can be remedied by stopping car shutting off (letting car get to sleep mode). Then restarting and driving away. Shifts smooth as silk then.
Car has 157,000 miles on it, original owner, transmission serviced like clockwork most recently at 150,000 miles. Fluid looked perfect. Although the clunk issue seems to be a bit more persistent now. Videos below:
Link to Clunk Video:
https://drive.google.com/file/d/1xEFLS2Dzjvtd4d7adQDXiAPDw2POtwrN/view?usp=sharing
Link to restart video (issue gone):
https://drive.google.com/file/d/18NbzNGaGmflW_LCR9JMy7ScDZNlsxZfx/view?usp=sharing
I have a theory as to what this is, but want to get your opinion before I tear things apart. Thanks!
The transmission develops a very harsh shift after driving at slow speeds. Most always can be remedied by stopping car shutting off (letting car get to sleep mode). Then restarting and driving away. Shifts smooth as silk then.
Car has 157,000 miles on it, original owner, transmission serviced like clockwork most recently at 150,000 miles. Fluid looked perfect. Although the clunk issue seems to be a bit more persistent now. Videos below:
Link to Clunk Video:
https://drive.google.com/file/d/1xEFLS2Dzjvtd4d7adQDXiAPDw2POtwrN/view?usp=sharing
Link to restart video (issue gone):
https://drive.google.com/file/d/18NbzNGaGmflW_LCR9JMy7ScDZNlsxZfx/view?usp=sharing
I have a theory as to what this is, but want to get your opinion before I tear things apart. Thanks!