It's actually 2.56 with a 305 and yes it struggles with anything heavier than say a bass boat and trailer nevermind anything with wind resistance.
i'm juggling options here as far as upgrading or just getting another truck.
Basically, i want to tow about 5000lbs.-----average car and tandem axle open car trailer, which i know a 1/2 ton really can't do, but thought i could do it temporarily, because, as you know, i'm cheap. Weight distributing hitch, lower axle ratio.