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Originally Posted by s.mac22
Does anyone have an idea?
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There is chance the "new" transmission may be at fault. The hard shifting is caused by the PCM operating the tranny at maximum hydraulic pressure attempting to protecting the tranny after detecting excessive long shifting twice per engine start cycle. It seems to be a common problem with the 4T65E transmission in our cars to do the hard shifting after stop-go traffic, mine included and was addressed with a rebuild along with a lost 4th gear 3 years ago.