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2013-14 Shelby GT500
Pinion Nut Torque With Solid Spacer
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<blockquote data-quote="SteveWK" data-source="post: 15902336" data-attributes="member: 139323"><p>Got the car back with 3.73s. It does whine. It whines between 50 and 70 mph and then seems to go away. I couldn't do much testing because of traffic and won't really have a chance to drive it until tomorrow or Sunday, but it does whine. It is loud enough that it bothers me. I don't think it should whine at all right out of the box.</p><p></p><p>Now for some numbers:</p><p></p><p style="margin-left: 20px">Stock 3.31s prior to removal</p><ul style="margin-left: 20px"> <li data-xf-list-type="ul"><span style="font-size: 15px">Backlash - 0.012</span></li> <li data-xf-list-type="ul"><span style="font-size: 15px">Pinion Bearing Preload - 25 in-lb</span></li> </ul></p> <p style="margin-left: 20px">New 3.73s</p><ul style="margin-left: 20px"> <li data-xf-list-type="ul"><span style="font-size: 15px">Backlash 0.010</span></li> <li data-xf-list-type="ul"><span style="font-size: 15px">Pinion Bearing Preload - 20 in-lb</span></li> <li data-xf-list-type="ul"><span style="font-size: 15px">Pinion Nut - 180 ft-lb</span></li> <li data-xf-list-type="ul">Solid Spacer</li> </ul> </p><p></p><p>I have to qualify the pinion preload on the new gears. I stopped by the shop and they had the pinion installed at 25 in-lbs and 180 torque on the pinion nut. I found out today after they installed the pinion seal the torque measured on the pinion jumped to 35 in-lbs. They then reshimmed the solid spacer so it had 20 in-lb with the pinion seal installed. In my mind this was a mistake. The whole idea of measuring torque required to turn the pinion gear is to measure pinion bearing preload. Who cares what the pinion seal adds to the party since it is not contributing to the pinion bearing preload. Thus I believe the pinion bearing does not have enough preload.</p><p></p><p>The whine is not as loud as some I have heard on YouTube, but it doesn't exude quality in my mind and they charged me $1k for the install since my rear suspension mods required more work to remove (torque arm and watts link).</p><p></p><p>On the bright side, love the gear. I use to fear the gear and was debating between 3.55 and 3.73. I now wonder what a 3.90 or 4.10 would be like in this car. 2nd gear with Toyo R888s and some basic mods is just a complete riot.</p><p></p><p>You have all been helpful and I will keep you up-to-date as this progresses. I don't think I'm truly going to be satisfied unless I do it myself, but time will tell.</p></blockquote><p></p>
[QUOTE="SteveWK, post: 15902336, member: 139323"] Got the car back with 3.73s. It does whine. It whines between 50 and 70 mph and then seems to go away. I couldn't do much testing because of traffic and won't really have a chance to drive it until tomorrow or Sunday, but it does whine. It is loud enough that it bothers me. I don't think it should whine at all right out of the box. Now for some numbers: [INDENT]Stock 3.31s prior to removal [INDENT][LIST] [*][SIZE=4]Backlash - 0.012[/SIZE] [*][SIZE=4]Pinion Bearing Preload - 25 in-lb[/SIZE] [/LIST][/INDENT] New 3.73s [INDENT][LIST] [*][SIZE=4]Backlash 0.010[/SIZE] [*][SIZE=4]Pinion Bearing Preload - 20 in-lb[/SIZE] [*][SIZE=4]Pinion Nut - 180 ft-lb[/SIZE] [*]Solid Spacer [/LIST][/INDENT][/INDENT] I have to qualify the pinion preload on the new gears. I stopped by the shop and they had the pinion installed at 25 in-lbs and 180 torque on the pinion nut. I found out today after they installed the pinion seal the torque measured on the pinion jumped to 35 in-lbs. They then reshimmed the solid spacer so it had 20 in-lb with the pinion seal installed. In my mind this was a mistake. The whole idea of measuring torque required to turn the pinion gear is to measure pinion bearing preload. Who cares what the pinion seal adds to the party since it is not contributing to the pinion bearing preload. Thus I believe the pinion bearing does not have enough preload. The whine is not as loud as some I have heard on YouTube, but it doesn't exude quality in my mind and they charged me $1k for the install since my rear suspension mods required more work to remove (torque arm and watts link). On the bright side, love the gear. I use to fear the gear and was debating between 3.55 and 3.73. I now wonder what a 3.90 or 4.10 would be like in this car. 2nd gear with Toyo R888s and some basic mods is just a complete riot. You have all been helpful and I will keep you up-to-date as this progresses. I don't think I'm truly going to be satisfied unless I do it myself, but time will tell. [/QUOTE]
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2013-14 Shelby GT500
Pinion Nut Torque With Solid Spacer
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