u/Remarkable-Bug4552

Hey everyone, can y'all help me figure out why this is happening? I have changed my Y stepper motor, tightened my Y axis belt, made sure that the wheels on the Y axis don't have any chips or cracks. I've even changed out the stopper switch on the Y axis and I cannot figure out why these drastic and varying layer shifts are occurring. I have an Ender 3 Pro with klipper on a raspberry pi4.

Hey, does anyone know where I can find another one of these little black gear wheels? I'm trying to replace my Creality 4240 for my Y-axis and am having a hard time finding a replacement gear wheel.