only problem I've had with mine is that now when I'm in high gear and mash the throttle, the fucking thing won't downshift half the time and misses the shift, or if it does downshift it goes in way too hard....I think it's a problem with a vacuum line (I hope) or else it may be time for a rebuild....from what I gather though the 4L60E's lifespan gets a little questionable anyways after 100,000 miles