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2015+ S550 Mustangs
Drivetrain Modification/Discussion
2015+ Mustang Super 8.8 Gear Swap
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<blockquote data-quote="burnin4" data-source="post: 15233155" data-attributes="member: 39304"><p>I have a question for you guys....I have an auto 3.15, clutch packs in my oem rear differential are not holding up, needing to upgrade my diff but there are no options for the aluminum housing. I don't mind upgrading to the cast iron housing, but does it accept a 3.15, or is it 3.55/3.73 only? I'm trying to keep my 3.15's but want to build a strong rear diff for drag racing, Weltrac diff or something like it. I need to stay in 3rd through 140 traps, which the 3.15 allows (28.8tire/7800rpms) but a 3.55 requires the extra shift at 124mph into 4th. </p><p></p><p>I'm fearful if I build a strong diff (Weltrac/3.55's) that my et's will suffer, at the expense of about $2200. Also, did you guys use the Whipple Flare tool to recalibrate your speedometer? Thanks for the help!</p></blockquote><p></p>
[QUOTE="burnin4, post: 15233155, member: 39304"] I have a question for you guys....I have an auto 3.15, clutch packs in my oem rear differential are not holding up, needing to upgrade my diff but there are no options for the aluminum housing. I don't mind upgrading to the cast iron housing, but does it accept a 3.15, or is it 3.55/3.73 only? I'm trying to keep my 3.15's but want to build a strong rear diff for drag racing, Weltrac diff or something like it. I need to stay in 3rd through 140 traps, which the 3.15 allows (28.8tire/7800rpms) but a 3.55 requires the extra shift at 124mph into 4th. I'm fearful if I build a strong diff (Weltrac/3.55's) that my et's will suffer, at the expense of about $2200. Also, did you guys use the Whipple Flare tool to recalibrate your speedometer? Thanks for the help! [/QUOTE]
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