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2011-2014 Mustangs
2011-2014 Mustang Talk
Umi antihop kit installed and new noise...
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<blockquote data-quote="5lho" data-source="post: 12685595" data-attributes="member: 134994"><p>LCAs can and will transmit rear end noises to the cabin. 8.8s are notorious for being noisy, especially with steep ratios in them. This is something Ford has chosen to ignore for decades now. Foundationally, the issue is setup error. Unlike a rear end setup you pay for, where a pattern is run and checked, etc., the 8.8 is set up on the line by torquing a crush sleeve to a specified torque value. This is supposed to get it in the right range for pinion depth. Problem is, it often doesn't. </p><p></p><p>This is less crucial with a 2.73 rear end but, the steeper the ratio, the more likely these setup errors will manifest as noise. Hence, big rubber bushings connecting the axle to the cab. Tighten stuff up and you reveal what's really going on back there. There's no danger of breakage, it's just an irritation. </p><p></p><p>Mine's a tetch too deep on PD, from the factory. I ran the pattern, for the hell of it, when I changed out the rear gear fluid. Hence, there's a tiny moan between 120-140 kph with UMI LCAs on. Not enough for me to rip it apart though.</p></blockquote><p></p>
[QUOTE="5lho, post: 12685595, member: 134994"] LCAs can and will transmit rear end noises to the cabin. 8.8s are notorious for being noisy, especially with steep ratios in them. This is something Ford has chosen to ignore for decades now. Foundationally, the issue is setup error. Unlike a rear end setup you pay for, where a pattern is run and checked, etc., the 8.8 is set up on the line by torquing a crush sleeve to a specified torque value. This is supposed to get it in the right range for pinion depth. Problem is, it often doesn't. This is less crucial with a 2.73 rear end but, the steeper the ratio, the more likely these setup errors will manifest as noise. Hence, big rubber bushings connecting the axle to the cab. Tighten stuff up and you reveal what's really going on back there. There's no danger of breakage, it's just an irritation. Mine's a tetch too deep on PD, from the factory. I ran the pattern, for the hell of it, when I changed out the rear gear fluid. Hence, there's a tiny moan between 120-140 kph with UMI LCAs on. Not enough for me to rip it apart though. [/QUOTE]
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2011-2014 Mustang Talk
Umi antihop kit installed and new noise...
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