I recently bought my GN and it has a recipt for the car having the trans rebuilt by level 10 within the last 5000 miles. it says on the receipt that a stall converter and shift kit were installed. My question is the trans shifts firm and does not slip at all, but why cant i chirp the tires between shifts like i hear of so many people doing? i dont understand as it is a built tranny and it doens have any other problem. i have played witht he tv cable, but it jujst delayed the shifts. what could be wrong?