What in the 4r100 is failing if it doesn't grab at a stop? As if you were in a stick shift and put the clutch in? Slight hill and you do not apply brake and roll backwards? Or hit the throttle from a stop and it revs because it isn't in a gear then drops in like dumping the clutch and smokes the tires? I knew not going with BTS would be biting me in the ass just wasn't expecting it to be in less than 5,000 miles.