Let's say I'm going from zero to forty, my RPMs will hit over 3000, but when it shifts, the RPMS will drop down to 2000-ish really hard, making the car jerk. It's not a smooth drop, it's like a split second. Upon acceleration there is also a very rapid knocking sound. There's no lights on my instrument cluster.
This trouble all started after I had my alternator die, then having the car towed a few months back. Ever since then this problem has been getting worse.
Anyone have any ideas what this could be?