Thanks for the input. It sounds like the converter may be OK but I may not be geared tall enough. I might have to change out the 4.56 gear for a 4.30 and see if it'll pull the extra gear.
Tom, the tracks around here are 800 - 1500 feet but when we go a little further west we can get into some serious elevation. I know some guys have got high elevation tune ups, but I'm having enough of a challenge putting together 1 good local tune up!