So as it turned out my tranny decided it was tired. The delayed up shift was caused by a dirty pressure control solenoid which in turn was caused by the 3 4 clutch pack being burned out.
Sounds like what happened to mine. Dont suppose you had to drive 350 miles in 2nd gear though...
Trans-Continental Trailblazer -5th Award Current Count of Transmission Rebuilds:5.5 ***The more you know, the less you need.*** USMC '07-'12 Dirty Bacon's Build