I know this is a week point on the t56 trannys. I check my tranny and it has a steel sleeve (magnet sticks to it). I was wondering if that meant I have an upgraded sleeve or is that not the case. I guess what I am asking is the stock sleeve with problems aluminum or steel? If the stock sleeves are aluminum then I guess mine has been upgraded, if the stock ones are steel then I guess I don't know what I have, lol.