Ray,
If you don't have the TH-350 yet, you might want to consider an overdrive model so you can run a little more rear gear and still have better economy. Take a look at this website for comparison of 200, 350,400,700 etc. If you can't find it, but are interested, let me know and I'll try to e-mail you a condensed version I did in MS Word.
Joe
http://my.en.com/~thall/olds/oftrn.htm
