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Cobra Forums
2015+ Shelby GT350 Mustang
4.09 or 4.11
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<blockquote data-quote="ANGREY" data-source="post: 16095480" data-attributes="member: 188865"><p>Some updates.</p><p></p><p>1) After soliciting opinions and doing exhaustive research, more teeth is better. Even though more teeth on the pinion makes for weaker teeth, the increased amount of teeth increases the contribution from the incoming and outgoing tooth. When the current tooth engaged is at 100% contact, the incoming and outgoing teeth generally have partial contact and that total % outweighs any strength benefits to bigger (and less teeth).</p><p></p><p>At any rate the people at US Gear/Axletech indicated for HP levels in question, both 4.11 and 4.09's are more than sufficiently strong. They also indicated that with their super stealth cutting and multi-angle for the teeth, neither would be distinguishable in terms of noise.</p><p></p><p>2) Someone at Summit had mentioned to me that when FRPP secures a product (for their brand name) they generally lock it down and secure exclusive licensing/sales rights. So US Gear can't sell the 4.09s as they're exclusive to FRPP (for the Super 8.8 with IRS).</p><p></p><p>3) The people at Axletech/US Gear ALSO mentioned that the reason Ford secured a 4.09 is because apparently, there's a threshold/limitation with CARB for anything 4.10 or bigger. I'm not sure if Ford ever put them into anything they've sold from the factory, but that's what he told me.</p><p></p><p>4) US Gear offers their ISF (Isotropic Finish) for like $70 for a ring and pinion. What I'm probably going to do is buy a set of FRPP 4.09's and send them off to US Gear and have them do the finish.</p></blockquote><p></p>
[QUOTE="ANGREY, post: 16095480, member: 188865"] Some updates. 1) After soliciting opinions and doing exhaustive research, more teeth is better. Even though more teeth on the pinion makes for weaker teeth, the increased amount of teeth increases the contribution from the incoming and outgoing tooth. When the current tooth engaged is at 100% contact, the incoming and outgoing teeth generally have partial contact and that total % outweighs any strength benefits to bigger (and less teeth). At any rate the people at US Gear/Axletech indicated for HP levels in question, both 4.11 and 4.09's are more than sufficiently strong. They also indicated that with their super stealth cutting and multi-angle for the teeth, neither would be distinguishable in terms of noise. 2) Someone at Summit had mentioned to me that when FRPP secures a product (for their brand name) they generally lock it down and secure exclusive licensing/sales rights. So US Gear can't sell the 4.09s as they're exclusive to FRPP (for the Super 8.8 with IRS). 3) The people at Axletech/US Gear ALSO mentioned that the reason Ford secured a 4.09 is because apparently, there's a threshold/limitation with CARB for anything 4.10 or bigger. I'm not sure if Ford ever put them into anything they've sold from the factory, but that's what he told me. 4) US Gear offers their ISF (Isotropic Finish) for like $70 for a ring and pinion. What I'm probably going to do is buy a set of FRPP 4.09's and send them off to US Gear and have them do the finish. [/QUOTE]
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2015+ Shelby GT350 Mustang
4.09 or 4.11
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