Ceeze

I just bought my truck an I burnt out the spur gear. I took it apart an I think put it back wrong. The top of trans. On the shaft I have the key. Then I put the disc that attaches an slides into the key there is a rubber inside then the other metal part that slides into that. Looking on the video it says that this other metal disc should have to eyelets to lock into the other piece but it doesn’t have that. I’m pretty sure that when I took it apart it did not have that plate in there but it was on after the spur then bearing then washer then this like kinda metal disc, spring then nut. But I didn’t put this disc on the end this time cause it doesn’t show it in the video. It moves very little bit when I hit the gas. When I let off the throttle it stops