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2013-14 Shelby GT500
Putting in 3.73s in a couple of weeks. Few questions...
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<blockquote data-quote="jchristena" data-source="post: 15652490" data-attributes="member: 143838"><p>Well, I do believe I have this solved. I tore it down the night of my followup post(Tuesday I think?) and re-measured the backlash. It had opened up to .012. So, either I ****ed up and read the dial back indicator wrong the first time, or it opened up(which shouldn't happen w/ the already broken-in/worn bearings you'd think). Either way, here's the deal.</p><p></p><p>My factory shims were really close. .275 driver's and .277 passenger's. I swapped these to be .277 driver's and .275 passenger's to achieve what I THOUGHT was .008. Given that it was .012 when I tore it back down, for whatever reason, I had to reshim. Keep in mind my total shim thickness, which gave whatever the quiet factory preload was, was .552.</p><p></p><p>I setup my gears this time a little tighter than spec. .006 backlash. I know this is tight but I've had good luck w/ this before. I ended up with .557 overall thickness this time which obviously increases overall bearing preload a bit. I think after beating on it, I'll be right at .008.</p><p></p><p>When I drove it, it was immediately substantially quieter. I think the backlash had a little to do w/ this but mainly I think it was the increase in preload. Initially, there was some bearing noise but that has quieted down substantially after about 200 miles and several heat/cool cycles. And the best part is I reused the same gears. Yea, they only had 20-30 miles on them but you could see the wear pattern on the gears and it looked good. </p><p></p><p>Bottom line, as others have said, I think more carrier bearing preload is better rather than too little. YMMV, but sometimes it works out.</p></blockquote><p></p>
[QUOTE="jchristena, post: 15652490, member: 143838"] Well, I do believe I have this solved. I tore it down the night of my followup post(Tuesday I think?) and re-measured the backlash. It had opened up to .012. So, either I ****ed up and read the dial back indicator wrong the first time, or it opened up(which shouldn't happen w/ the already broken-in/worn bearings you'd think). Either way, here's the deal. My factory shims were really close. .275 driver's and .277 passenger's. I swapped these to be .277 driver's and .275 passenger's to achieve what I THOUGHT was .008. Given that it was .012 when I tore it back down, for whatever reason, I had to reshim. Keep in mind my total shim thickness, which gave whatever the quiet factory preload was, was .552. I setup my gears this time a little tighter than spec. .006 backlash. I know this is tight but I've had good luck w/ this before. I ended up with .557 overall thickness this time which obviously increases overall bearing preload a bit. I think after beating on it, I'll be right at .008. When I drove it, it was immediately substantially quieter. I think the backlash had a little to do w/ this but mainly I think it was the increase in preload. Initially, there was some bearing noise but that has quieted down substantially after about 200 miles and several heat/cool cycles. And the best part is I reused the same gears. Yea, they only had 20-30 miles on them but you could see the wear pattern on the gears and it looked good. Bottom line, as others have said, I think more carrier bearing preload is better rather than too little. YMMV, but sometimes it works out. [/QUOTE]
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2013-14 Shelby GT500
Putting in 3.73s in a couple of weeks. Few questions...
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