Thanks for the help guys. This sounds do-able enough. Now I have an excuse to go parts shopping!
FredT - thanks for the specific instructions. That's exactly the kind of help I need!
Joker, it doesn't change after it warms up. I drove it to town and back twice today (about 30 miles each time). I did get it up to the 65+ mph range (I almost never drive that fast), and it seemed to have a little more "range" - about 12 mph swing each way when it was at highway speed.