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2013-14 Shelby GT500
Solid differential spacer results
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<blockquote data-quote="Catmonkey" data-source="post: 15072800" data-attributes="member: 124025"><p>You might substitute a .025" shim for a .018". It won't be exact science, but if you end up with an additional .012" for the preload, you won't change the backlash that much if you add .005" on one side and .007" on the other. You would need to drive the cast iron shim next to the thickest shim you have in your stack, not the thinnest. You could also determine the total shim size using the smaller shims and order the correct cast iron shim, if you want to wait a few more days to put your car back together. </p><p></p><p>Anytime you're going to change the gears or the differential, the original shims are not likely to get you within specs, so you need enough shims to make minor adjustments in both directions to get the proper drive and coast patterns. This is pretty precise work and some special measurement tools are needed to do this right. You may find yourself needing to press the pinion bearing on and off a few times to get the correct shims between the bearing and the pinion gear to get the right pattern on a new gear set. With a new differential and the original gears, you will need to get the backlash close to what it was before you took it apart with the preload setting. Your OEM shims are not likely to get it right either. When I installed a trutrac I needed an additional .015" of shims to get the right pre-load using the OEM gears.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 15072800, member: 124025"] You might substitute a .025" shim for a .018". It won't be exact science, but if you end up with an additional .012" for the preload, you won't change the backlash that much if you add .005" on one side and .007" on the other. You would need to drive the cast iron shim next to the thickest shim you have in your stack, not the thinnest. You could also determine the total shim size using the smaller shims and order the correct cast iron shim, if you want to wait a few more days to put your car back together. Anytime you're going to change the gears or the differential, the original shims are not likely to get you within specs, so you need enough shims to make minor adjustments in both directions to get the proper drive and coast patterns. This is pretty precise work and some special measurement tools are needed to do this right. You may find yourself needing to press the pinion bearing on and off a few times to get the correct shims between the bearing and the pinion gear to get the right pattern on a new gear set. With a new differential and the original gears, you will need to get the backlash close to what it was before you took it apart with the preload setting. Your OEM shims are not likely to get it right either. When I installed a trutrac I needed an additional .015" of shims to get the right pre-load using the OEM gears. [/QUOTE]
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2013-14 Shelby GT500
Solid differential spacer results
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