Been a while since I posted but this caught my eye.
I had the same problem with my 72 TR6. Took a while to solve the problem but
I would bet money this is your problem too.
My problem was with the face of the hubs. Mine turned out not to be flat but
had a noticeable runout. You can check yours by removing the tire and wheel
and with a run out guage check the surface front to back and top to bottom.
If you a that there is an issue have them surface ground at a machine shop.
Simple process. Solved my problem immediately....
What occurs when they are bad is when you tighten down the lug nuts the
wheel is actually distorted to match the face of the hub.
Alex Manzo
72 TR6
59 TR3A
----- Original Message -----
From: <thenicholls@verizon.net>
To: <r_rochlin@hotmail.com>; <triumphs@autox.team.net>
Sent: Tuesday, November 03, 2015 12:26 AM
Subject: Re: [TR] Vibration at Speed
> 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 aga
> in 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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