I have a 90 LS 400 with 250,00 miles on it. I was told by the dealer's mechanic that the transmission needed to be replaced or rebuilt because it is sluggish from 0 to 25 miles per hour. This is a $2,500 to $4,000 job! It performed normally at highway speeds but sometimes would stutter. My brother recommended that I have the transmission flushed and put some Lucas Trans Fix in it. The local Lube place he took me to stated that they couldn't do a trans flush on a Lexus, so me and my brother just put one quart of Lucas Trans Fix in it. I saw a significant improvement in acceleration right away, but it is not perfect. We are going to remove the transmission pan, drain the fluid and add two quarts of Lucas when it gets warmer (its cold in Chicago). In the meantime the overdrive off light continuously flashes. I have no idea why this occures. Has anyone had similar problems? Any advice?