I have a 2000 Integra GSR with 68,000 miles on it. I have noticed that the clutch will make a popping noise when I put it into reverse and begin to engage the clutch as I back up slowly. It is almost like it pops each time the axle is spinning around. It doesn't do it when I put the car in 1st and engage the clutch as I move forward, only backwards so far. What do you think it is? Thanks in advance for any help.