HI,
We have a 1976 Ford F250 4X4 that we have been restoring SLOWLY we have ran it over the years for Farm Work and it has always been a tough truck, things got hectic and we let it sit for a couple of years and just got it running again, Everything seems fine except for when you get it up to speeds of 40 mph or more it shimmy's when you turn left??
we checked all the lugs, etc.. Front end was replaced a while back and it wont do it if you are driving slower or straight not even when you turn right, only left any ideas??????
Thanks

poor alinment, check the ball joints too.