[Chief of the 60's]

Originally Posted by Carmine

I am familiar with the overdrive transmissions, and I appreciate everyone's experience and input, but I really don't have a desire for one. The car I am looking at presently, has the 2 speed automatic. As I mentioned in my initial thread, I'm not a big proponent of it. My objective would be to have a little bit better get up and go. Whatever I do buy, will never see slicks. Maybe a little red light action, occasional nostalgic drags, but that's it. I would never abuse or beat this car. I go on an interstate highway maybe twice a year, 40 miles round trip, so highway driving shouldn't be an issue. My normal driving is primary roads at about 45-50 mph. I think the ideal gear ratio, for what I want it for, would be 3.55's. No interest in any numerically higher numbers. My '71 GTO with the TH400 has 3.55's and it works well for me. I guess I'm leaning towards the TH350 because it's a direct bolt in, I can use many of the original parts, and I don't have to alter the transmission tunnel. I would never consider butchering that area. It's certainly good to know all the things that the members are sharing, so I guess I better get a car lol, Carmine.

That right there is a text book example of an oxymoron.

Here is some food for thought as well as looking at this from an economical angle. That car with any non-OD tranny will tach at around 3800 RPM at 55 mph. With an OD, that same car, same engine and same rear gear will tach at about 2200-2400 RPM at 55 mph.

Now, without even talking about fuel economy, an engine that is running at a much lower RPM will last a hell of a lot longer because it is experiencing a lot less wear & tear.

There are also no tunnel mods necessary for a 700R4/4L60/4L60e.