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Unread 10-12-2013   #1 (permalink)
James8026 is offline Rookie


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Default 70 fastback shakes like crazy please help

I have a 1970 fastback and my car shakes going down the road almost violently but I have replaced the tires, done an alignment ,replaced wheel bearings balljoints control arms the front tires have no play everything is tight. im wondering if broken motor or tranny mounts can cause this it seems as though its in the front until about 60mph and then sounds like its the rear end vibrating and all through it shakes the whole acceleration. I have checked all the rear end mounts and they are intact and the shocks are new. what else might I be missing that could cause this??
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Unread 10-12-2013   #2 (permalink)
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Have you checked the u-joints and driveshaft?
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Unread 10-12-2013   #3 (permalink)
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Ok...diagnostics.....

1. Is the vibration occur at a constant speed, acel and/or decal?
2. Does it occur at the same level when the vehicle is in neutral and traveling at the speed of occurance?
3. Does the steering wheel shake or is it a vibration through the whole car?

If the vibration disappears when the vehicle is in neutral....engine (harmonic balancer-likely) or flywheel/tq converter improperly balanced...

Otherwise...bad rims, bad tires (yes even though they have been balanced)....driveshaft or wheel bearings (front or rear) or bent axle. Next step is raise the car up in the air and run the engine (with the wheels off the ground)...if there is vibration...drivetrain/diff/rear wheel bearing/rear wheel/tire....if there is none...front end.
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Unread 10-15-2013   #4 (permalink)
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Hello James, and Welcome to our Great Site here at AFM
Make sure that you check out our Year/Platform specific Forum pages so you can Post or just Read about The Stangs that our Members have that are of your Mustangs Same Year/Era
You can Navigate to the whole Site by clicking on the "Tech" Icon at the upper right hand side of this Forum page. Have Fun.
And Thank You for Joining All Ford Mustangs

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