For illustrative purposes, we're showing this with the shifter out of the car. The measurement is actually made inside the car with the shifter mounted. Pull the handle forward into third gear and insert a 0.030-inch feeler gauge between the shift stop and handle. Have a friend tighten the bottom nut and Allen screw from under the vehicle while you apply pressure on the shifter arm with the feeler gauge in place. Then move the shifter into fourth gear and make the same 0.030-inch setting.