at 55mph, load or not, a 3/4T truck w/ stock 5.14 rear gears would have a 235 reved to the limit - no suprise it wouldn't accelerate up a hill w/ a load on 235's are strong motors at mid range rpm, not so great above 3000!
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
235's are strong motors at mid range rpm, not so great above 3000!