Hi guys , im new here so ill just ask and see if anyone knows whats going on. I have a 2001 Eclipse GT 3.0 160.000 miles on it. Engine works fine , transmission shifts smooth ( smooth enough ) without jerking or revving up BUT when you try to give it beans and rev past 4000 RPM when it shifts it hits hard , the whole car jerks like drove over a speed bump . Only happens at that point other wise shifts perfectly fine. What can it be?