Sorry, stand corrected I stuffed up on my wording on that one. They will only have an overdrive ratio once the converter is locked. But if you put an overdrive on a Trimatic your probably not going to get a true overdrive without a converter lock and I wouldn't think It would be possible on a Trimatic. Much better off going a later transmission and if your not using a PCM to control it you will need an aftermarket controller module which can get a bit expensive.