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Have a '73 with the hydramatic 400 3 speed trans and I would like to get one with overdrive in it. Has anyone done this. What should I get and for about how much. Is there any used trans that I can use that comes from some other car?
I put in a 200-4R and love it.
I have a 3.55 rear gear and I get about 18mpg on a road trip. I also enjoy the better 1st/2nd gear ratio for better takeoffs.