Sounds like the 1st to 2nd gear slam.
Have you checked fluid levels in your transmission or changed filters? Do you get any codes on insta-d, foxwell, etc?

Sent from my SM-A528B using Tapatalk

__________________
"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course