Re: Th350 vs. 700R4
I definetly prefer the 700R4. The 1st gear ratio in the 700 is around 3.0:1 versus the 350 or 400 ratio of around 2.5:1 which gives you much better off the line power and crawling ability. The overdrive gear is also nice for highway cruising. About the concerns of shifting between 3rd and 4th (OD), I only shift it into OD once out on the highway and keep it in Drive around town or on curvy rounds.
And of course, if you have big tires and stock gearing is will have more of a tendency to shift between OD and 3rd, especially on grades. I also want to address the previous post which states "it would shift down and I would keep losing speed until the top". If the 700R4 shifts down into 3rd gear, there should be absolutely no performance difference between it and the 400 because both the 3rd gear of the 700, and 3rd gear of the 400 are the same ratio of 1.0:1. I do agree that a 700 will hunt between 3rd and OD on a grade, but all you have to do is manually shift into 3rd until you get to the top.