I have 95 Century with a two month old reconditioned tranny that appears to be downshifting to third gear at around 60 mph, usually on a slight downgrade. Shortly after this started happening on a more regular basis, I also noticed a 25% decrease in fuel economy. (It is due for an oil change and maybe new spark plugs, so perhaps the lower gas mileage is just a coincidence.) Does this sound like a major tranny problem....??
Thanks, Clueless in Texas