1973 Dodge Dart sport speed related shimmy
a follow up to a post I had
I wish you guys would simply add on to your previous post, I'm assuming this is part of or is the same problem?
You said something about "new wheels and tires?
Are the wheels and or tires "new" since the last time around?
How have the wheels and tires been checked?
For balance?
For true
For true "on the car?" (Jack it up turn the wheels, use a home-made pointer on some scrap wood, etc)
Is there any play you can determine in the steering? What have you or anyone done about looking over things from front to rear?
Play in general in suspension, steering? Have a friend wiggle the steering wheel in various speeds and amounts while you look at movement underneath
Ditto the rear. Have a friend "jostle" the car left/ right at the rear while you look for movement underneath. Look CAREFULLY for movement between the wheels and rear brake drums (loose wheel)
Look CAREFULLY at the leaf mounts, the axle U bolts.
Shackle and leaf mounts?
Rear axle U bolts?
===========================================
At this point I would find a stretch of level road that is little use, "out" somewhere. Find a friend with a second car. Get two or three guys with you, two in the other car. A video camera AND I DON'T MEAN A PHONE might be of help
Have them follow you, drive near along side, maybe along BOTH sides and look for wobble in wheels / tires / suspension.
Have a friend ride with you. Hang his head out the window, front/ rear, and look at the tires / wheels going down the road.
=============================================
As bad as you describe this being, it should be easy to find. Crap, the only time I've had a shimmy that bad was on the beat - up old Landcruiser, and it had been down in the mud, stones, woods. "Things get bent." "Mud gets in the wheels"