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· Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
17,568 Posts
Bearings usually growl. Tires can shake and shimmy that changes with speed.
Are tire pressures OK? Any scalloping or 'bumps' felt in the tire carcass. Try a rotate to see if it changes the sensation? Is there another vehicle with the same size wheels that you could swap over for a road test?
Is this felt more in the floor, seat or steering wheel? Can you look down and watch you knee shake while driving?
U-joints can get worse under load and the shudder can feel like it's coming from everywhere. They spin ~4 times faster the than tires.
Chock the wheels, pull the driveshaft and articulate the front and rear joints up/down and left/right to feel for any binding in the needle bearings.
Finding the cause will be a process of elimination.
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