Why does my 2002 Saturn auto trans. slam into gear when it shifts?

Maybe take the vehicle to have the mounts checked.

You need to replace your valve body. I picked one up from the scrap yard 50-60 bucks. Brand new part can be upwards of a grand. Google reverse slam for the sl2 saturn I had that issue which eventually turned into many gears. I guarantee I'm right 10000000% There are videos in how to do it, it's actually very easy to do just follow the instructions. If the new valve body from the scrap yard didn't work bring it back and try a new one i haven't had an issue since I did it