Rear Diff Cover Bolts
Thread Starter
Senior Member
Joined: Dec 2023
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From: Natchitoches, La
Rear Diff Cover Bolts
I'm going to service the rear differential in my 2015 2WD, it has a super 8.8. The bolts are pretty crusty, and I want to replace them with some ARP stainless bolts when I get the cover off. Anyone know the size of the bolts?
Beeps and Boops
Joined: Oct 2020
Posts: 2,667
Likes: 1,786
From: Iowa
I would never use hardware store bolts in my diff. Unless you have a special magic hardware store, you're going to end up with cheese-weak grade 5 bolts that will get rusty eventually, black oxide-coated strong bolts that will get rusty immediately, or even weaker stainless bolts that will still eventually rust and/or fuse to the diff housing.
You don't need huge strength in each bolt to hold the diff cover to the diff - you DO need a strong bolt that won't snap when you try and remove the bolt after it gets fused to the diff housing by years of dirt and salt and corrosion.
To tag onto what 52merc already said, this B&M diff cover kit comes with 9x M10x1.5 bolts:
https://static.speedwaymotors.com/pdf/20041296.pdf
ARP has a set of M10x1.5 x 25mm long bolts, two of these kits would get you enough for the diff:
https://www.summitracing.com/parts/arp-762-1002
ARP's "Stainless 300" is rated at a tensile strength of 170ksi, higher than grade 10.9 normal bolts (150ksi). Plus it won't rust.
You don't need huge strength in each bolt to hold the diff cover to the diff - you DO need a strong bolt that won't snap when you try and remove the bolt after it gets fused to the diff housing by years of dirt and salt and corrosion.
To tag onto what 52merc already said, this B&M diff cover kit comes with 9x M10x1.5 bolts:
https://static.speedwaymotors.com/pdf/20041296.pdf
ARP has a set of M10x1.5 x 25mm long bolts, two of these kits would get you enough for the diff:
https://www.summitracing.com/parts/arp-762-1002
ARP's "Stainless 300" is rated at a tensile strength of 170ksi, higher than grade 10.9 normal bolts (150ksi). Plus it won't rust.
Beeps and Boops
Joined: Oct 2020
Posts: 2,667
Likes: 1,786
From: Iowa
Thread Starter
Senior Member
Joined: Dec 2023
Posts: 360
Likes: 320
From: Natchitoches, La
I would never use hardware store bolts in my diff. Unless you have a special magic hardware store, you're going to end up with cheese-weak grade 5 bolts that will get rusty eventually, black oxide-coated strong bolts that will get rusty immediately, or even weaker stainless bolts that will still eventually rust and/or fuse to the diff housing.
You don't need huge strength in each bolt to hold the diff cover to the diff - you DO need a strong bolt that won't snap when you try and remove the bolt after it gets fused to the diff housing by years of dirt and salt and corrosion.
ARP has a set of M10x1.5 x 25mm long bolts, two of these kits would get you enough for the diff:
https://www.summitracing.com/parts/arp-762-1002
ARP's "Stainless 300" is rated at a tensile strength of 170ksi, higher than grade 10.9 normal bolts (150ksi). Plus it won't rust.
You don't need huge strength in each bolt to hold the diff cover to the diff - you DO need a strong bolt that won't snap when you try and remove the bolt after it gets fused to the diff housing by years of dirt and salt and corrosion.
ARP has a set of M10x1.5 x 25mm long bolts, two of these kits would get you enough for the diff:
https://www.summitracing.com/parts/arp-762-1002
ARP's "Stainless 300" is rated at a tensile strength of 170ksi, higher than grade 10.9 normal bolts (150ksi). Plus it won't rust.
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Beeps and Boops
Joined: Oct 2020
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From: Iowa
