Why Does car feel like it will shake itself apart anywhere above 65 mph???? I never really noticed it before. Only thing that changed is I had a flat tire fixed and had all four rotated. They were all rebalanced too, and I checked the air pressure. So what gives???? I can't stand these speed wobbles...I am embarassed to drive above 65. Anybody have any ideas???

 

It could be a couple of things.

When they balanced your tires did they speed balance them??
Most tires stores out there do the speed balancing now-a-days, but maybe they didn't.

Also check your tires again to see if any of the weights came off.
Check outside and inside or each rim.

If both the above are ok, then the only thing I can think of is a bad control arm.
But that you would feel through the steering wheel.

These are no definates, but something to check for.


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91 Mystic Teal RS Convertible (1 of 5,000+ made in '91)
Stock 305 TBI W/125,000 miles
Auto Trans, Stock Rear End
Stereo
Nakamichi CD-35z, Infinity Kappa Series 4x6 & 5 1/4" speakers, Fosgate 12" sub in a custom box, 200watt amp for the sub.
Future Mods & Add Ons

• Infinity Basslink
• Hooker Headers
• 3" Exhaust using Flowmaster 80 series muffler
• MSD Ignition
• K&N Filter
• Some Suspension Improvements

Dream Machine
Same car full blown with a 9" rear end and all the needed mods to help keep it on the pavement.
(aka) Something I'll never have!!
[*][*]

 

Since is started after the rotation and flat repair, have all the balance rechecked on all the tires. Explain to the shop that you now have a vibration. Have them checked for slipped belts and stuff as well. You may have already had a tire problem and that tire was on the back. Put it on the front and it became noticeable.

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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, current red metallic paint. Lots of other stuff...
82camaro