Hi I recently purchased a 2000 Mustang GT / 5 speed manual and had a question , The car runs awesome but If I try to shift from 1st to 2nd fairly quickly it likes to grind when going into 2nd gear a lot of the time, even when I know I'm pushing the clutch in all the way (When driving the car normally It doesn't happen), Is this a possible issue with the transmission? The car has 59,100 miles on it. Thanks in advance.