I'm considering buying aa 93 ls400. The car is in great shape overall. Except... I've been told that it will just lock up and won't move. The guy said it's there transmission. He had it flushed and then it worked fine for a month then froze up again. When it freezes you can shift it into any great doesn't matter tho it won't move. Engine revs but car didn't move. The car is $1000. And I can buy it. Right now it starts runs and moves. But idk for how long and am afraid to test drive it have it freeze up and need to be towed. Also I don't want to spend money on a new trany filter and fluid just to test drive it and find out that the trany is shot. Anyone have any suggestions or ideas. I'm a mechanic have a great shop. Lifts, compressors, trany jacks, everything I could ever need. And plenty of ability. What should I do?