Bob, I have a 72 TR6 myself, the whole front end has been rebuilt, and the
tires are all in balance.
I have a vibration between 60 and 65, I just step on the gas and go a little
faster until it stops.
It has always been that way so I am kind of used to it.
Good luck with yours.
Craig
72 TR6 Vienna, VA
On 11/02/15, Bob Rochlin<r_rochlin@hotmail.com> wrote:
Hi Everyone,
Over the summer I got a new set of Michelins for my TR6. The old tires were 15
years old and were causing some shimmy vibration as well as being well past
safe. This was in connection with getting my wire wheels straightened and
trued. The wires guy, New England Wire Wheel, mounted and balanced the tires
with a Snap-on static balancer . When I got the wheels back on the car I went
out for a ride and felt a definite vibration between 65 and 75 MPH. I concluded
that the wheels needed to be rebalanced with a dynamic balancer. I found a shop
who could balance the tires correctly and had them rebalanced. The tires were
little better, but there was still a pronounced vibration in the seat and body
at 65 to 75 MPH. I brought the tires back to the tire shop and they graciously
first checked the tire balance and then rebalanced them. They said that the
balance was of about a 1/4 oz. , and that two of the tires seemed to be a very
slightly out of round. I mount those tire on the rear, but again the same
problem.
I've moved the tires from front to back thinking if the offending tires were
on the front wheels the vibration would be through the steering wheel and not
the frame. No joy. My thought is that there is something in the driveline
causing the vibration, perhaps the rear brake drums worn out of balance. The
drive shaft was balanced 5 to 6 years back. Over the years i've replaced all
the universal joints. As far as I can tell the rear drums are original to the
car, as are the half shafts.
Before I start pulling the driveline apart I thought I see If anyone has had a
similar problem of a suggestion of where to go next. I'd appreciate the input.
Bob
72'TR6
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