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SportTrac Discussion
Wheels, Tires & Brakes
New Tires..let the shaking begin
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<blockquote data-quote="Michael Cacioppo" data-source="post: 574574" data-attributes="member: 57235"><p>The "out of balance" steel drive shafts are BS. The Trac is on a 14" longer frame than the explorer. The bending moment on the extended drive shaft becomes extremely sensitive to any out of balance condition. Some engineer forgot to carry the "1" when calculating the problem caused by the added length. Using aluminum reduces the mass and therefore the force causing the vibration is also reduced. Doesn't it sound to reason that if it were only a simple mechanical imbalance problem, that it would be cheaper for FORD to re-balance the steel shaft rather than replace it?</p><p></p><p></p><p></p><p>Wheel mass also exhaserbates the problem as does slightly out of round tires. That is why the problem seems to get better or worse when one of these components is changed. That's the way I see it.</p></blockquote><p></p>
[QUOTE="Michael Cacioppo, post: 574574, member: 57235"] The "out of balance" steel drive shafts are BS. The Trac is on a 14" longer frame than the explorer. The bending moment on the extended drive shaft becomes extremely sensitive to any out of balance condition. Some engineer forgot to carry the "1" when calculating the problem caused by the added length. Using aluminum reduces the mass and therefore the force causing the vibration is also reduced. Doesn't it sound to reason that if it were only a simple mechanical imbalance problem, that it would be cheaper for FORD to re-balance the steel shaft rather than replace it? Wheel mass also exhaserbates the problem as does slightly out of round tires. That is why the problem seems to get better or worse when one of these components is changed. That's the way I see it. [/QUOTE]
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SportTrac Discussion
Wheels, Tires & Brakes
New Tires..let the shaking begin
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