when ever i accelorate hard in first or the car chugs in it i hear a lound noise which i believe is my shift selector bar hitting my driveshaft at the point where the bar meets the lever on the gearbox. i can see that when the car is in first, the bar rubs on some of the surronding are that would be the floor in the middle between the 2 front seats. i just put the gearbox back in and this didnt happen before. what am i missing? any hints? thanks for any leads!