I must have had a different model 56 3100 with a 235 and a granny box trans, than everyone is talking about. I drove it on the freeway all the time here in SoCal. It was never topped out at 50-55 MPH. I have had many 3100s over the years and never had any trouble keeping up with the traffic. These trucks all had 3.9 gears and stock 235s.
