Sounds like death wobble. Check the alignment again, and the looseness of tie-rod and drag link joints. If you have the old spring ball socket tie-rod ends, those would be suspect. Can you stop it by making a turn?
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
