once upon a time I had a 2001 LS with 178K on it and the trans went out. I put a used (80K) transmission in it and then sold it shorty after. I know the car had high miles but I am still concerned with these transmissions not having the best track record from what I recall seeing, and since they are not the smoothest thing I have ever driven. I just want to make sure that I keep up on my maintenance not only on the engine, suspension, and so on, but the transmission as well. My question to you all is: -what do you do to your transmission and what milage intervals? -Do you do any additives, or anything people should look for, etc. -Do it your self or have it done?