Hi folks. Been lurking here since I got my PSD for towing a race car a couple of weeks ago. It's dead stock, lots of miles. Was told by previous owner Ford reman tranny installed 25,000 miles ago. I got an Edge unit with it, not sure which model offhand, my question: will putting it on the lowest setting, 40 hp(?) put too much load on the old girl. I'd hate to blaze up a hill feeling like a king and have to walk home, get my old Chevy 454, and tow the whole mess home. Thanks for any help.