hello.
i have a 57 also, and all new front suspension parts, king pins, newer tapered style tie rod ends, etc, but i also get a shake at 60mph. i jacked up my front end just until the tires were barely off the ground, and spun each front tire and found my drivers side tire is way out of round, like by 3/8 of an inch. so i suspect this is my problem,a nd will find out when i get my new front rims and tires in about a month.
also, believe it or not, i once had a 1970 mustang, got 4 new tires and had the front end all rebuilt. at about 60mph it would shake very violently,a nd i couldnt figure it out.
well, my dad told me to check the tires as i described above, but found that i had a way out of round BACK tire.
took it to a tire shop that trued tires, (its like a lathe machine that cuts rubber off to true it up), and after that it ran perfect.
so even an out of round rear tire can cause the entire truck to shake.
down here they dont true tires anymore, for some reason. if you have an out of round tire, you will just have to replace it.
hope this helps.
leonard
