Ok- - - - -first question- - - -is the end product going to be a real truck or a Cowboy Cadillac? There's a reason a rig with a 1.5 ton rating and most likely a 235 engine has a low geared rear axle. Getting a full load moving, and climbing hills at more than a snail's pace in 1st. or 2nd. gear is going to need some gearing down somehow. You might be better off finding a Brownie auxiliary trans with an overdrive ratio and turning that 4 speed into a 12 speed. You'll have a better top end without losing the ability to haul stuff. If the heaviest thing it's going to carry is a Yeti cooler and a few lawn chairs on the way to a tailgate party, go ahead and gear it up, but please get the steering, lights, and brakes up to par before you try to keep up with traffic out there on the Super Slab!
Once you learn to do the gearjammer's dance with two shifters, you'll be able to impress all your friend, also!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!