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Mustang Forums
2011-2014 Mustangs
Driveline/Suspension
Very annoying high pitch whine after driveshaft installation, HELP pls.
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<blockquote data-quote="jojobee" data-source="post: 13245579" data-attributes="member: 138089"><p>Ok guys, i have made more tests and definitely need more help from some of you with knowledge in suspension geometry and pinion angles</p><p></p><p>1) I have swapped fluid and it was not the cause of the whine</p><p></p><p>2) The whining/turbine noise is only audible when the car in in drive and moving, gears dont matter. Its immediately audible from very low speed and increases until the exhaust covers it.</p><p></p><p>3) With the car on candles and the rear suspension unloaded the noise isnt there.</p><p></p><p>4)When the car is moving and i release the gas thus relieving the pressure on the drivetrain the whine diminishes quickly</p><p></p><p>4) Now what does that mean..when the rear suspension is loaded does that change my pinion angle. According to my shop they set they angle at -2.</p><p>Is this correct for my setup?</p><p></p><p>5) This started immediately after in installed a Dynotech ds and BMR relocation brackets</p><p>Could this affect my geometry and pinion ?</p><p></p><p>6)Since my ds is not vibrating at all could it still be my pinion angle that is incorrect ?</p><p></p><p>7)Last my rear tires are 1in taller than stock and i'm lowered 1in on P springs.</p><p>The second hole was used on my BMR relo brackets, i dont see how this could cause the noise.</p><p></p><p></p><p>So guys help me out what do you think it is, i dont believe the ds alone could change the harmonics so much.</p><p></p><p>My next step is to look for that noise on a dyno with the suspension loaded and play with the pinion but i am not convinced.</p><p></p><p>I'm open to ideas cause this is very annoying <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></p></blockquote><p></p>
[QUOTE="jojobee, post: 13245579, member: 138089"] Ok guys, i have made more tests and definitely need more help from some of you with knowledge in suspension geometry and pinion angles 1) I have swapped fluid and it was not the cause of the whine 2) The whining/turbine noise is only audible when the car in in drive and moving, gears dont matter. Its immediately audible from very low speed and increases until the exhaust covers it. 3) With the car on candles and the rear suspension unloaded the noise isnt there. 4)When the car is moving and i release the gas thus relieving the pressure on the drivetrain the whine diminishes quickly 4) Now what does that mean..when the rear suspension is loaded does that change my pinion angle. According to my shop they set they angle at -2. Is this correct for my setup? 5) This started immediately after in installed a Dynotech ds and BMR relocation brackets Could this affect my geometry and pinion ? 6)Since my ds is not vibrating at all could it still be my pinion angle that is incorrect ? 7)Last my rear tires are 1in taller than stock and i'm lowered 1in on P springs. The second hole was used on my BMR relo brackets, i dont see how this could cause the noise. So guys help me out what do you think it is, i dont believe the ds alone could change the harmonics so much. My next step is to look for that noise on a dyno with the suspension loaded and play with the pinion but i am not convinced. I'm open to ideas cause this is very annoying :( [/QUOTE]
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2011-2014 Mustangs
Driveline/Suspension
Very annoying high pitch whine after driveshaft installation, HELP pls.
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