Just picked up an 07 Shelby GT500 vert, it has 3000miles on it, 4:10 gears , tune, exhaust an i think a 2.6 upper. Anyways ive only driven the car about 6 times so far since i got it i gotten on her an just cruised, an i took it out today just driven her normally an when i went to take it out of first an put it in 2nd there was a grinding noise an i could feel it in the shifter, so then i picked up speed still cruisin put in third with no problems all other gears are fine , still crusin , so i slowed down a bit an went to put it down into second and again made a loud grind noise an then went into 2nd, its only second thats doing this an it never did this any other time, any ideas as to what this could be and it doesnt do it when im going really slow only from about 20mph and up! upshifting or downshifting! I think the car also had some clutch work done but its so new to me i havent got the specifics yet! Its does this even when the clutch is pushed in all the way its when i go to move the shifter into the 2nd gear slot!