We have a Saturn SL2 that the kids drive (well DS17 now, the twins next year). DS had some problems with it yesterday and we think the transmission is going-suspected this was going to happen sooner or later, 140,000 miles. The rest of the car is in great shape so the dilemma is fix it or get another used car. If we fix the transmission can we expect, on average, to get another say 60,000 miles or more out of the car? I wish I knew more about cars. Any info is appreciated.

People always get stuck on the one time price of a major automobile repair and immediately want to go out and just buy a new car that is going to cost them a LOT more money in the long run, no matter what the up front cost might be. Very short sighted. We've been guilty of it in the past ourselves (ironically, trading in an SL2 on an ION from Saturn in 2004, lol).