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Mmmm...
you have a Delta 88? Not something I would expect from someone who also has owned a Toyota Supra 
Anyway, what year is it? Is it the old big one or the littler downsized one? Either way...
Also, I'm surprised an 88 has overdrive, always thought that kind of thing was for smaller/sportier cars
It was free
.It's an '86, first year of the FWD H platform. I wouldn't call it little though, it's longer then GM's new(ish) U platform minivans (well, the SWB ones. But still, it's a coupe!).
Like I said, overdrive is cheaper then adding another gear. Even when GM finally started making 4 speed autos, overdrive makes it a 5 speed.