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Old 08-14-2019, 09:35 AM   #26
1971Stepside
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Re: 12 bolt rear diff cover

Went to order it and it shows out of stock...
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1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3000 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Other toys always push it aside, but one day....one fine day, she will be back on the road.

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Old 08-14-2019, 11:19 AM   #27
KMC3420
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Re: 12 bolt rear diff cover

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Originally Posted by 1971Stepside View Post
Went to order it and it shows out of stock...
Go figure. the part number is: A9070PBK, and when googling that, I found the below one.

Diff Cover

It shows as out of stock as well. You might email or call them to determine when these might be back in stock.
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Last edited by KMC3420; 08-14-2019 at 12:25 PM.
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Old 08-14-2019, 12:31 PM   #28
1971Stepside
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Re: 12 bolt rear diff cover

Thank you for that. Looks like they are the same place. I called and he said 4 to 6 weeks. I will keep an eye on it. I don't have to have one right away.
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1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3000 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Other toys always push it aside, but one day....one fine day, she will be back on the road.

www.paypal.me/Cape505

"I can't complain, but sometimes I still do. Life's been good to me so far."
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Old 08-14-2019, 12:41 PM   #29
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Re: 12 bolt rear diff cover

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Originally Posted by 1971Stepside View Post
Thank you for that. Looks like they are the same place. I called and he said 4 to 6 weeks. I will keep an eye on it. I don't have to have one right away.
I will keep my eye peeled for a good straight one since your not far from me. I frequent the Springfield craigslist page.
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Old 08-18-2019, 12:44 AM   #30
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Re: 12 bolt rear diff cover

Picked this one up several years ago off ebay.
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Old 08-24-2019, 10:47 AM   #31
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Re: 12 bolt rear diff cover

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Picked this one up several years ago off ebay.
Z10, that looks good! I saw it on eBay as well for roughly $70.
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Old 08-24-2019, 10:49 AM   #32
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Re: 12 bolt rear diff cover

I mounted my cover on and it fits as it should with no issues. I still need to sandblast and paint it, but Iím happy with the results.
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Old 08-24-2019, 10:55 AM   #33
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Re: 12 bolt rear diff cover

On another note I purchased ARP cover bolts and to my surprise they are too long. At this point I can grind the excess off and true the bolts up with my bench top grinder or stack washers which would be far less time consuming. Not sure if others have ran into this and ARP may make a shorter 12 bolt cover bolt. Sorry in advance for the sideways pictures.
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Old 08-24-2019, 02:53 PM   #34
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Re: 12 bolt rear diff cover

The bolts that come with the aftermarket covers are too long as well. I just re-used my originals.
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Old 08-24-2019, 03:23 PM   #35
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Re: 12 bolt rear diff cover

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The bolts that come with the aftermarket covers are too long as well. I just re-used my originals.
I purchased washers to use to decrease the length of the bolts, but am unsure if I will use them. I might just reuse my stock bolts.
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Old 08-24-2019, 10:39 PM   #36
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Re: 12 bolt rear diff cover

I did some more digging and the stock rear diff cover bolts are 5/16-18, .50” in length under head, serrated. The ARP bolts for a 12 bolt rear cover are 5/16-18 and .750” long under head, part # 437-3002. A more ideal ARP bolt to use would be the 612-0560 bolt, it is 5/16-18, .560 under head length and after using the washer the bolt is right at .50” in length under the head of the bolt while using the washer.
I know this is nerd bolt info but maybe it will help somebody down the road that is using the stock steel cover. The ARP .750” length bolts might work well with an aluminum cover if it’s a thicker casting.

ARP Bolts
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Old 08-25-2019, 10:43 AM   #37
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Re: 12 bolt rear diff cover

Nice, great info. Thanks for sharing!
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Old 06-04-2020, 06:45 PM   #38
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Re: 12 bolt rear diff cover

Quote:
Originally Posted by KMC3420 View Post
Go figure. the part number is: A9070PBK, and when googling that, I found the below one.

Diff Cover

It shows as out of stock as well. You might email or call them to determine when these might be back in stock.
Thanks for sharing. Picked up front and rear black differential covers from Assault Racing Products to replace the chrome covers on my 72 Blazer. Less than $12 per cover plus $10 for shipping is a great deal.

https://www.assaultracing.com/item/4...-truck-12-bolt
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Last edited by Green Monster; 06-04-2020 at 07:01 PM.
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Old 06-04-2020, 10:35 PM   #39
KMC3420
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Re: 12 bolt rear diff cover

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Thanks for sharing. Picked up front and rear black differential covers from Assault Racing Products to replace the chrome covers on my 72 Blazer. Less than $12 per cover plus $10 for shipping is a great deal.

https://www.assaultracing.com/item/4...-truck-12-bolt
They are nice pieces for the price! Mine was the same thickness as OEM.
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Old 06-05-2020, 08:07 AM   #40
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Re: 12 bolt rear diff cover

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Originally Posted by KMC3420 View Post
On another note I purchased ARP cover bolts and to my surprise they are too long. At this point I can grind the excess off and true the bolts up with my bench top grinder or stack washers which would be far less time consuming. Not sure if others have ran into this and ARP may make a shorter 12 bolt cover bolt. Sorry in advance for the sideways pictures.
Ahh posting on years old threads... Big Block Chevy/Pontiac oil pan bolts are the perfect bolt for the diff cover. I like to use stud kit on 2x4 trucks that aren't likely to be in rocks and keep bolts on a 4x4.

Canton stainless stud kit on Amazon less than $20. Same with Mr. Gasketbolt kit. And you get 20 of them instead of 10. Two sets will let you do 3 diffs with 4 extra bolts.
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Old 06-05-2020, 11:11 AM   #41
Green Monster
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Re: 12 bolt rear diff cover

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Originally Posted by Mike C View Post
Ahh posting on years old threads... Big Block Chevy/Pontiac oil pan bolts are the perfect bolt for the diff cover. I like to use stud kit on 2x4 trucks that aren't likely to be in rocks and keep bolts on a 4x4.

Canton stainless stud kit on Amazon less than $20. Same with Mr. Gasketbolt kit. And you get 20 of them instead of 10. Two sets will let you do 3 diffs with 4 extra bolts.
The price on Spicer differential bolts surprising ($1.41 ea to 16.99 ea)

An alternative would be nice.

Is this the Mr. Gasket Bolt Kit you are referring to?
https://www.amazon.com/Mr-Gasket-608...1369688&sr=8-7
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Old 06-05-2020, 09:04 PM   #42
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Re: 12 bolt rear diff cover

Yes, that 6086 kit is the big chevy/pontiac kit.

Here is the Moroso version:
https://www.amazon.com/Moroso-38560-...1405271&sr=8-1

The Canton stud kit:
https://www.amazon.com/Canton-Racing...1405285&sr=8-1

Milodon bolt kit:
https://www.amazon.com/Milodon-85005...405430&sr=8-17
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Old 06-30-2020, 01:38 AM   #43
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Re: 12 bolt rear diff cover

Replaced the chrome differential covers front and back with black OE style covers. It looks cleaner in my opinion. Thanks for your help tracking these down for only $35.
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Old 06-30-2020, 09:52 AM   #44
KMC3420
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Re: 12 bolt rear diff cover

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Replaced the chrome differential covers front and back with black OE style covers. It looks cleaner in my opinion. Thanks for your help tracking these down for only $35.
Sweet Blazer! I agree that the black cover does look cleaner as well.
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