:confused:I've got a 1950 Dodge pickup with a three speed on the column and fluid drive. It's got a 4:11 rearend which I want to keep. Soon it will have a bored-out 230 with dual carbs, cast iron headers/dual smithy's, and a mild cam. I like the 4:11 for driving I do in the foothills around here but, needles to say, the top speed is a little wanting. I'd like to go to an overdrive unit and I've followed with interest all the discussion on the forum regarding such. One of the things I don't understand (of many...) is whether I should be looking for both the overdrive and the transmission, or whether I can use the three speed that's on my truck.