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SVTPerformance's Chain of Restaurants
Road Side Pub
Deciding between P.P S550 or 03/04 Cobra
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<blockquote data-quote="IronSnake" data-source="post: 15628342" data-attributes="member: 46336"><p>Steve,</p><p></p><p>The drive line angle is atrocious and quite possibly highway robbery on the S550. This is due to the pumpkin "hanging" in the cradle assembly. Combine this with the lack of proper alignment from the factory (many find their subframes aren't centered under the car due to oversized holes and undersized bolts), you inevitably end up with a poor design that disregards basic engineering standards like driveline angle and deflection.</p><p></p><p>Case in point:</p><p><img src="https://s7d4.scene7.com/is/image/Turn5/2015-mustang-lsds_thumb?$transpProd$&" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>As you see, the bolts securing the differential are on the same plane as the ground. Therefore the bushings stand on their end, and since they are winglet type, they sag due to weight. Once driveline load is introduced into the equation, the front of the differential rises and falls based on the load introduced. This GREATLY changes the driveline angle that already starts out horrible and NVH goes all to hell.</p><p></p><p>So most think, just install solid bushings then or hell, even poly. Well that's great, except it's been proven that under hard load, the ears like to break and the bolts are designed with the threaded portion in shear. Big companies have come out and tried to adjust for driveline angle that gets amplified when using a one piece driveshaft, however the only way to properly fix this is by jacking with the transmission mount, engine mounts, and canting the IRS assembly up or down on the front mounting points.</p><p></p><p>Needless to say without saying more, it's a bit of a cluster ****. As someone that poured a lot of money into his car, the IRS in the S550 is trash and deserves to be hated. The simple fact they hung the differential on four bolts in shear tells me Ford really gave zero shits. Compound with the crap paint quality, they can keep it. The coyote doesn't make up for crap engineering elsewhere.</p><p></p><p>Steven</p></blockquote><p></p>
[QUOTE="IronSnake, post: 15628342, member: 46336"] Steve, The drive line angle is atrocious and quite possibly highway robbery on the S550. This is due to the pumpkin "hanging" in the cradle assembly. Combine this with the lack of proper alignment from the factory (many find their subframes aren't centered under the car due to oversized holes and undersized bolts), you inevitably end up with a poor design that disregards basic engineering standards like driveline angle and deflection. Case in point: [IMG]https://s7d4.scene7.com/is/image/Turn5/2015-mustang-lsds_thumb?$transpProd$&[/IMG] As you see, the bolts securing the differential are on the same plane as the ground. Therefore the bushings stand on their end, and since they are winglet type, they sag due to weight. Once driveline load is introduced into the equation, the front of the differential rises and falls based on the load introduced. This GREATLY changes the driveline angle that already starts out horrible and NVH goes all to hell. So most think, just install solid bushings then or hell, even poly. Well that's great, except it's been proven that under hard load, the ears like to break and the bolts are designed with the threaded portion in shear. Big companies have come out and tried to adjust for driveline angle that gets amplified when using a one piece driveshaft, however the only way to properly fix this is by jacking with the transmission mount, engine mounts, and canting the IRS assembly up or down on the front mounting points. Needless to say without saying more, it's a bit of a cluster ****. As someone that poured a lot of money into his car, the IRS in the S550 is trash and deserves to be hated. The simple fact they hung the differential on four bolts in shear tells me Ford really gave zero shits. Compound with the crap paint quality, they can keep it. The coyote doesn't make up for crap engineering elsewhere. Steven [/QUOTE]
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SVTPerformance's Chain of Restaurants
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Deciding between P.P S550 or 03/04 Cobra
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