jerky

I'm having an issue where when pressing on the accelerator I get a bump that can be felt through the entire vehicle, it's been doing it for a while and can't remember when it started. It also does the same whenever letting off the gas, seems like the whole car jumps almost, it's not severe, but...

Hello forum!, good to see such a strong community, awesome!. Ok well, here is my issue(s) I put my 99 explorer XLT 5.0 v8 into drive, start to move forward and all of the sudden, the car "hard" shifts into second gear. It's not slipping, its just jerking hard into the next gear. It happens...