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JExpedition07

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Just a quick little overview of what “Super 8.8” denotes :)

So in 2015 with the releases of the S550 Mustang and 13th gen F-150 Ford decided to revisit and redesign the 8.8” Sterling axle that had been in production throughout the nineties. If you are not aware, the Sterling 8.8 is the “LS engine” of the axle world, it is commonly retrofitted in Jeeps etc for off-road builds. The original 8.8 was a 28, and then 31 spline setup. Adding splines necessitates a larger diameter in the axle, so the 31 spline 8.8 is the most sought after version. Enter the “super 8.8” in 2015, Ford went to a 34 spline axle, increasing the axle diameter yet again to contend with the higher torque demands of modern powertrains. Attached (Left) is the old 31 spline 8.8 and (Right) is the new 34 spline Super 8.8 pinion
Ford F-150 “Super 8.8” a bit more than a name IMG_6018


So what are the key upgrades?
  • Front/outer & rear/inner pinion bearings in the Super 8.8 were carried over from the previous 9.75” Ford rear-end
  • Crush sleeve, pinion seal, and pinion nut all came from the earlier 9.75” model
  • 34 spline axles and differentials
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fordtruckman2003

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Have one but didn't know anything about it. It is confusing looking for differential cover with drain plug. I was reading super 8.8 is not compatible with 8.8 covers.
 
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JExpedition07

JExpedition07

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Have one but didn't know anything about it. It is confusing looking for differential cover with drain plug. I was reading super 8.8 is not compatible with 8.8 covers.
You are correct friend, the 34 spline 8.8 is a 12 bolt cover, the old 31 spline 8.8 is a 10 bolt cover
 

Big Dog Daddy

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Have one but didn't know anything about it. It is confusing looking for differential cover with drain plug. I was reading super 8.8 is not compatible with 8.8 covers.
I would also like to see Ford performance come out with a nice cover that has a drain for the super 8.8
Great information! @JExpedition07 thanks for sharing. 👍
 

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fordtruckman2003

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My 2011 had the 9.75 so the super 8.8 shares some of same parts?
 
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JExpedition07

JExpedition07

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My 2011 had the 9.75 so the super 8.8 shares some of same parts?
Yes pinion bearings, crush sleeve, pinion seal & nut are all from the previous 9.75” axle. The larger diameter shafts to accommodate the 34 splines are also shared as the 9.75” was also a 34 spline.
 

Samson16

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You mentioned “previous” 9.75, so is my ‘22 9.75” different?
 

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JExpedition07

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