6l50 6-speed transmission flaring on 3-4 shifts with light throttle the majority of the time. Random weird harsh shifts on other gears to the point of chirping tyres on 1-2 shift. Sometimes once in a while won't shift past second gear and when it changes to third it goes straight back to second like limp home mode but this normally occurs in 3rd gear not 2nd.

Over 75% throttle it shifts nice and firm every time.

Confirm all the described transmission behaviors.