How much does the trailer weigh, where do you want to tow it, and how fast do you want to go.

While someone will jump in here say back in the day they hauled huge loads with a 235, the truth is they didn't go very fast that way. And going up hills was slow going.

What rear gears are you running?

For a truck asked to work I'm likely to conclude the six is the wrong motor, but before making that assessment a good understanding of your expectations is important.

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...