I'm posting this for someone who has torque converter shudder. It was really bad and the following product took care of most of it. http://www.lubegard.com/automotive/trans_atf.html Is this safe? He is thinking of using another one to get rid of it completely. He has an aftermarket converter BTW. http://www.lubegard.com/automotive/trans_shudder_fixx.html Any views on this?