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2013-14 Shelby GT500
Pinion Nut Torque With Solid Spacer
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<blockquote data-quote="Bad Company" data-source="post: 15915587" data-attributes="member: 141815"><p>The crush spacer is only used to set the pinion bearing pre-load. The problem I had and the reason I ended up using 3 of them to get the pre-lod set correctly was because I had the bearing treated by MicroBlue Racing. MicroBlue told me to use 1/2 of the factory pre-load spec for new bearings. I couldn't believe there was going to be that much of a difference. The first spacer I set pre-load to stock specs. It was obvious after doing this that it was way too tight. The pinion felt notchy as I turned the pinion by hand afterwards. The second spacer I went too far on the bearing pre-load. I had 5 in-lbs and barely turned the locknut and went to 10in-lbs, which was still too tight. On the third one I spent a considerable amount of time sneaking up on the 6 in-lb spec MicroBlue told me to use in the first place. If you go past the spec you're trying to set the pre-load at, you can NOT loosen the nut. You have to pull it apart and start over with a new crush spacer. </p><p></p><p>My total bearing pre-load for the rear with both the pinion and carrier bearing was 14 in-lbs, which is considerably lower than stock. This caused me to spend a lot of extra time making sure I had everything correct. I just couldn't believe the treatment of the bearings was reducing drag by that much, but when I set it to factory specs it was obvious that was too high. You could feel the bearings binding in the races at stock specs. </p><p></p><p>I never felt the whine in these rears comes from the crush spacer collapsing under load. Its job is only to hold forward to rear tension between the bearings. To start to have a crush spacer collapsing, you'd have to have a lot of distortion of the whole case. If that happens you'll have other things in the rear to worry about.</p></blockquote><p></p>
[QUOTE="Bad Company, post: 15915587, member: 141815"] The crush spacer is only used to set the pinion bearing pre-load. The problem I had and the reason I ended up using 3 of them to get the pre-lod set correctly was because I had the bearing treated by MicroBlue Racing. MicroBlue told me to use 1/2 of the factory pre-load spec for new bearings. I couldn't believe there was going to be that much of a difference. The first spacer I set pre-load to stock specs. It was obvious after doing this that it was way too tight. The pinion felt notchy as I turned the pinion by hand afterwards. The second spacer I went too far on the bearing pre-load. I had 5 in-lbs and barely turned the locknut and went to 10in-lbs, which was still too tight. On the third one I spent a considerable amount of time sneaking up on the 6 in-lb spec MicroBlue told me to use in the first place. If you go past the spec you're trying to set the pre-load at, you can NOT loosen the nut. You have to pull it apart and start over with a new crush spacer. My total bearing pre-load for the rear with both the pinion and carrier bearing was 14 in-lbs, which is considerably lower than stock. This caused me to spend a lot of extra time making sure I had everything correct. I just couldn't believe the treatment of the bearings was reducing drag by that much, but when I set it to factory specs it was obvious that was too high. You could feel the bearings binding in the races at stock specs. I never felt the whine in these rears comes from the crush spacer collapsing under load. Its job is only to hold forward to rear tension between the bearings. To start to have a crush spacer collapsing, you'd have to have a lot of distortion of the whole case. If that happens you'll have other things in the rear to worry about. [/QUOTE]
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2013-14 Shelby GT500
Pinion Nut Torque With Solid Spacer
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