Speedometer jumping

I have a 2009 Chevy Malibu and the speedometer has always been a little jumpy til about 15-20mph then it steadies out but since yesterday it’s been spiking bad and causing the transmission to jerk even if it’s not switching gear just moving slightly it feel really jerkish I’ve changed the speed sensor output in the past and it honestly was doing worse then the old one so I put that one back in but the speedometer will jump in drive, reverse, and even in park I just need to know where to start looking
Nothing sounds different maybe when the jerking it sounds like it’s reving down then back up and when I tried to change the speed sensor output it was jerking switching gears