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01-03-2020, 07:28 PM
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#1 |
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Registered User
Join Date: Nov 2018
Location: Yuba city, California
Posts: 86
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Axle GM 12 Bolt Rear end ID help
3817778 11-41 gm 12 65. Can someone De code please. I have a 1957 Chevy 3600 4x4 I’m rebuilding. Didn’t look good when I pulled the cover ���� Looks like it’s getting rebuild
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01-03-2020, 07:34 PM
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#2 |
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Registered User
Join Date: Nov 2018
Location: Yuba city, California
Posts: 86
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Re: Axle GM 12 Bolt Rear end ID help
[QUOTE=Bridgeman57;8653941]3817778 11-41 gm 12 65. Can someone De code please. I have a 1957 Chevy 3600 4x4 I’m rebuilding. Didn’t look good when I pulled the cover ���� Looks like it’s getting rebuild
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01-03-2020, 07:35 PM
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#3 |
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Post Whore
  
Join Date: May 2015
Location: Alabama
Posts: 14,692
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Re: Axle GM 12 Bolt Rear end ID help
3.73 gear ratio....open diff
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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01-03-2020, 07:37 PM
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#4 |
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Registered User
Join Date: Nov 2018
Location: Yuba city, California
Posts: 86
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Re: Axle GM 12 Bolt Rear end ID help
Any clue what year??
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01-03-2020, 07:45 PM
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#5 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,692
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Re: Axle GM 12 Bolt Rear end ID help
There should be numbers on the axle tube on pass side...but they'll only show month and day built...not yr
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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01-03-2020, 07:47 PM
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#6 |
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Registered User
Join Date: Nov 2018
Location: Yuba city, California
Posts: 86
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Re: Axle GM 12 Bolt Rear end ID help
Negative. Axles don’t show no numbers. They are wiped out. Need to figure out what year axle I have so I can spend some money
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01-03-2020, 07:57 PM
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#7 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,692
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Re: Axle GM 12 Bolt Rear end ID help
You mean axle or axle tube?...the numbers I'm referring are on the tube...
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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01-03-2020, 09:25 PM
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#8 |
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Registered User
Join Date: Nov 2018
Location: Yuba city, California
Posts: 86
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Re: Axle GM 12 Bolt Rear end ID help
After removing about an inch of grime. It says KDA 175 2
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01-03-2020, 09:32 PM
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#9 |
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Registered User
Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,794
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Re: Axle GM 12 Bolt Rear end ID help
first post has 12 65 = 12th month of 1965 mfd for the gear set .
__________________
77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
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01-03-2020, 10:07 PM
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#10 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,692
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Re: Axle GM 12 Bolt Rear end ID help
KD shows to be 2.73...but the 11-41 on r&p is 3.73
A should be assembly plant...but I'm not showing a A plant 175 is 175 day of yr is June 24 2 is 2nd shift
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 01-03-2020 at 10:23 PM. |
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01-03-2020, 10:38 PM
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#11 |
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Registered User
Join Date: Nov 2018
Location: Yuba city, California
Posts: 86
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Re: Axle GM 12 Bolt Rear end ID help
*correction - KDA w175 2 is in the pass side, top on axle tube
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01-03-2020, 10:51 PM
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#12 |
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Registered User
Join Date: Nov 2018
Location: Yuba city, California
Posts: 86
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Re: Axle GM 12 Bolt Rear end ID help
Perfect thank y’all. And how about the year? Is 1965 correct?
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01-03-2020, 10:55 PM
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#13 |
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Registered User
Join Date: Nov 2018
Location: Yuba city, California
Posts: 86
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Re: Axle GM 12 Bolt Rear end ID help
Found these 2 holes hiding under grime. Can’t be a good sign. Is this common? Probably rusted inside right?
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01-03-2020, 11:31 PM
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#14 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,469
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Re: Axle GM 12 Bolt Rear end ID help
Its a plug weld. nothing to worry about....
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01-03-2020, 11:57 PM
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#15 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,692
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Re: Axle GM 12 Bolt Rear end ID help
Agreed...its where the axle tube is welded to the differential housing
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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01-04-2020, 12:00 AM
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#16 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,692
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Re: Axle GM 12 Bolt Rear end ID help
The housing ratio Id doesn't match the r&p ratio..so I wouldnt go by that
The housing shows it used to be 2.73s The r&p is 3.73s
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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01-04-2020, 03:23 PM
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#17 |
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Registered User
Join Date: Nov 2018
Location: Yuba city, California
Posts: 86
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Re: Axle GM 12 Bolt Rear end ID help
Yeah will most likely keep it 3.73s. It’s just gunna be a DD. Thanks a lot! Looking to order new brakes or upgrade to disk and all new r&p set. What years would be safe and any good companies to consider? CCP and Yukon are nice but a little expensive. But you get what you pay for
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01-04-2020, 05:07 PM
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#18 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,692
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Re: Axle GM 12 Bolt Rear end ID help
I'd go Yukon gears...
__________________
Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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