so you want to know.
2000 F150, 5.4 L V8 (this is a 2 valve) 373 rear end it is rated for 8800 towing and has greatly expanded payload, tranny cooling and oil cooling tow package. I think the auto tranny is 3 speed with OD
motoring down the interstate at 65 it runs about 2800 to 3200 rpm (no OD) pulling that 8000 pound brick, (6900 dry plus cargo) getting up the hills she may downshift and 4000 rpm, not really an issue so much (haven't been to any mountains) getting into the two lane roads curvy and hilly I find myself progressing upwards at 40 to 45 mph at 5000 rpm. just seems to me I should not worry about mpg and change the ratio to getter up those hills with less stress. (maybe it just me, first large trailer you know, have gotten the advice before to find the sweet spot on the rpm and let sit there weather its 3200 or 5000)
I would hate to get to some real elevations and need more torque which changing the ratio does ???
Thanks