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Old 05-16-2015, 05:46 PM   #1
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Rear end question.

I have a 2004 Coupe with a 3.9 and a 7.5 with 3.27 gears. Anyway while replacing all the bearings and races with an overhaul kit I noticed that there is no S spring in between the spider gears. It not broken up or anything. It's just missing. Is there supposed to be one in there!? The reason I'm doing all of this is because I was getting some drivetrain vibration that seemed to be coming from the rear end. You can also hear it too. Sounds like an unbalanced tire or rim in between 50-65mph. When I'm slowing down the sound gets slower also. Same when I accelerate. Gets faster. You don't feel any vibration at low speeds. I have replaced both front hub Assemblies, all u-joints, and a front end alignment. It still there although the vibration has gotten a little better with the new u-joints. Let me know what you think about that S spring.

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Old 05-16-2015, 08:24 PM   #2
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probably a wheel bearing, also, the s spring i believe you're talking about is for limited slip differentials.. If you don't have a limited slip, you shouldn't have one.
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Old 05-16-2015, 10:15 PM   #3
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Ok thanks for the reply! What did the V6's come with from the factory?

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Old 05-17-2015, 01:03 PM   #4
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No limited slip lol. Hooray for one wheel peels


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Old 05-17-2015, 01:10 PM   #5
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Thanks guys!

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Old 08-27-2015, 06:18 PM   #6
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Well here is where I'm at now. Rear end rebuilt and checked by the shop. Everything is good. still has the same vibration. Now had my warranty replace the transmission. New rebuild. Still has a vibration. Not the same type though. This is more consistent. Not repetitive like before. So I bought a new Ford Racing aluminum driveshaft and swapped my old yoke with the ballencer on it onto the new driveshaft. The new one came with a yoke for the T5. Vibration is a lot better but still present. I'm now thinking its the ballencer on the old yoke. Can I remove this? The new driveshaft should be already ballenced from the factory. Do you think this will help out? I am sure it's not coming from the engine or harmonic ballencer. Thanks
Ken

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