Certain transmission models in the 1998-2003 Ford Taurus were very weak and failed on a regular basis. If you had that transmission…it had a high failure rate. If you owned the good model of transmission in those models then the failure rate was low. My wife inherited a 2003 Mercury with the bad transmission (2 replacements in just 35K miles). The problem was fixed when the bad model transmission was replaced with a used model that was good and the car now has about 200K on the clock. It also has a new owner (family member). I don’t know the models of the transmissions because I’m not a transmission guy. The only other transmission that I know of that was a bad model was a GM 700R4. They later redesigned that model and it’s nearly bulletproof now.