Okay, I know this is a dumb question. . . but do I have a three-speed or four-speed transmission? It shifts two times (three-speeds) but some how I got the idea that I had a four speed transmission. The owner's manual doesn't say. It's an '88, 420 SEL with a 722.3 transmission (I believe). Also, at what speed or rpm should it shift low-to-second, second-to-third?

Jerry