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2013-14 Shelby GT500
Slack in rear end
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<blockquote data-quote="Bad Company" data-source="post: 13424164" data-attributes="member: 141815"><p>The rear axle can make different types of noises, whether it has a mechanical problem or not. Pinion angles will usually cause a rumble and driveshaft vibration that is heard and felt at high speeds, if they are too far off of spec. This usually gets worse as speed increases, but it may actually smooth out somewhat after you pass through the worst part of it as speed continues to go higher. This is because it is a harmonic that will resonate more at certain speeds than others. From what you have said that you have done to the car and your complaint, I doubt the pinion angle is the problem</p><p></p><p>Any type of bearing problem will usually admit a rumble and harmonic. This rumble/harmonic again will increase and decrease as speed goes up and down. A bearing going bad on either the pinion gear or a carrier bearing will increase the backlash above spec. I would think you would also be complaining about the bearing noise increasing at the same time in your posts though. Also as the bearing tolerances become looser from the failing bearing, you will start to feel a harmonic vibration that will follow the noise changes at higher speeds. Failing bearings will usually change the sounds and vibrations they are admitting as you apply engine torque or float the driveline to the rear at a constant road speed where the rumble/harmonics are the worst.</p></blockquote><p></p>
[QUOTE="Bad Company, post: 13424164, member: 141815"] The rear axle can make different types of noises, whether it has a mechanical problem or not. Pinion angles will usually cause a rumble and driveshaft vibration that is heard and felt at high speeds, if they are too far off of spec. This usually gets worse as speed increases, but it may actually smooth out somewhat after you pass through the worst part of it as speed continues to go higher. This is because it is a harmonic that will resonate more at certain speeds than others. From what you have said that you have done to the car and your complaint, I doubt the pinion angle is the problem Any type of bearing problem will usually admit a rumble and harmonic. This rumble/harmonic again will increase and decrease as speed goes up and down. A bearing going bad on either the pinion gear or a carrier bearing will increase the backlash above spec. I would think you would also be complaining about the bearing noise increasing at the same time in your posts though. Also as the bearing tolerances become looser from the failing bearing, you will start to feel a harmonic vibration that will follow the noise changes at higher speeds. Failing bearings will usually change the sounds and vibrations they are admitting as you apply engine torque or float the driveline to the rear at a constant road speed where the rumble/harmonics are the worst. [/QUOTE]
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2013-14 Shelby GT500
Slack in rear end
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