SUV only goes into 3rd gear after high revs/RPMs

What is your question?

I have a 06 chevy trailblazer LS 2wd V6, so when you are driving it when it goes to shift from 2nd to 3rd it acts like it wants to go into 3rd but sounds/acts like its in neutral instead, going to attach what codes it is throwing, I have already replaced the 1-2 shift solenoid, 2-3 shift solenoid, and 3-2 control solenoid, and Trans fluid has been changed since, full and nothing in old fluid, and new filter. have replaced the throttle position sensor & pedal now, and it will go into 3rd after you rev it up then let off the pedal its the only gear it does this in...and it isn't throwing any codes now

How long has your 2006 Chevrolet Trailblazer had this problem?

not long