I was playing with the set screws so I hope that did screw it up. But what I did was turn them all the way in and back them off 1/8th of a turn. Then I went to the spring loaded screws and turned them in until it stoped the backed it off 4 turns on the second gear. I did the same for 3rd gear but backed it off 7 turns. I can not hear the truck shift Should you?