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2011-2014 Mustangs
Driveline/Suspension
annoying squeaks
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<blockquote data-quote="Norm Peterson" data-source="post: 16251713" data-attributes="member: 193960"><p>That's one, but it might not even be the most effective one.</p><p></p><p>Squeaks can and do occur between the flat faces of the poly and the chassis-side bracket. Worse when the poly bushing parts are longer than the inner sleeve that runs through them, because now the poly has to rotate inside the bracket under fairly heavy pressure. Shaving the poly to be a tiny bit shorter is one possible mod.</p><p></p><p>A slightly more effective tweak to that is this ↓↓↓</p><p>[ATTACH=full]1588184[/ATTACH]</p><p></p><p>The above sketch is slightly exaggerated - the cone shape can actually be "flatter" - the idea is that in addition to eliminating bushing to bracket friction, you give the polyurethane somewhere to "squish into" when the joint is twisted about an axis other than about the centerline of the inner sleeve and the bolt. This happens when the car rolls in a turn.</p><p></p><p>Long-term durability may or may not take a hit with the above mod, which is mainly intended for cornering/autocross/road course use rather than drag racing and similar driving. But poly bushings should be considered "consumable parts" anyway.</p><p></p><p></p><p>Norm</p></blockquote><p></p>
[QUOTE="Norm Peterson, post: 16251713, member: 193960"] That's one, but it might not even be the most effective one. Squeaks can and do occur between the flat faces of the poly and the chassis-side bracket. Worse when the poly bushing parts are longer than the inner sleeve that runs through them, because now the poly has to rotate inside the bracket under fairly heavy pressure. Shaving the poly to be a tiny bit shorter is one possible mod. A slightly more effective tweak to that is this ↓↓↓ [ATTACH=full]1588184[/ATTACH] The above sketch is slightly exaggerated - the cone shape can actually be "flatter" - the idea is that in addition to eliminating bushing to bracket friction, you give the polyurethane somewhere to "squish into" when the joint is twisted about an axis other than about the centerline of the inner sleeve and the bolt. This happens when the car rolls in a turn. Long-term durability may or may not take a hit with the above mod, which is mainly intended for cornering/autocross/road course use rather than drag racing and similar driving. But poly bushings should be considered "consumable parts" anyway. Norm [/QUOTE]
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2011-2014 Mustangs
Driveline/Suspension
annoying squeaks
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