Please suggest something. At my wits-end!

Shornaday said:
Years ago I bought some Goodyear tires for my 73 Gran Torino Sport. How long ago you ask! Well some of us old timers remember Woolco , plus the car was a new "73". Anyway had a similar situation vibrating over certain speed. I would check the tire and it would get warm, finally noticed it had a small area where there was a raised spot. Took the tire back and they said it was a twisted belt. Not too long after that I had a blowout on the left front. The tire tore the "HE double hockey sticks" out of the fender and wrapped it
self around the A-frame and ball joints. That tire was purchased the same time as the other bad tire. Moral of the story I wouldn't drive much on that tire until you get the problem resolved.

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I remember the Firestone tires were notorious for having shifted belt issues in that era (early 70's). My Dad's 70 Torino or 72 LTD had that issue, was just before I started driving.
 
Ken said:
I remember the Firestone tires were notorious for having shifted belt issues in that era (early 70's). My Dad's 70 Torino or 72 LTD had that issue, was just before I started driving.
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Those were Firestone 500 tires. Got a free set due to bad tires on my then new 1975 Mercury Montego. Firestone make much better tires today.
 
Tires & Vibration

Another thing you could try is swap the tires front to rear -- counterintuitive, but might isolate the front end wobble/shimmy.

Can also take BOTH front tires and rotate the tires 90 degrees on the rims/wheels and re-balance. Tire shop will probably understand, but won't be thrilled.

I had a problem with '04 DTR with winter tires. Around 70 got a front end vibe -- rebalanced both front tires. Still had trouble. Removed and re-installed summer setup and problem disappeared.
 
Thanks to all of you for your help and advice.
(That's why I still come here!)
I got the Coopers, and dumped the Khumhos.
Cheers to all of you. [emoji482]


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Also jack the car up so the tire is off the ground and spin it by hand. Check for runout/wobble. I've seen really silly stuff like tape weight residue stuck to the back side of the wheel at the mating flange and keeping the wheel from sitting flat on the hub. Looks fine on the balance machine. Wobbles on the car.
 
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