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

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

Re: Axle GM 12 Bolt Rear end ID help
 

3.73 gear ratio....open diff

Re: Axle GM 12 Bolt Rear end ID help
 

Any clue what year??

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

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

Re: Axle GM 12 Bolt Rear end ID help
 

You mean axle or axle tube?...the numbers I'm referring are on the tube...

Re: Axle GM 12 Bolt Rear end ID help
 

After removing about an inch of grime. It says KDA 175 2

Re: Axle GM 12 Bolt Rear end ID help
 

first post has 12 65 = 12th month of 1965 mfd for the gear set .

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

Re: Axle GM 12 Bolt Rear end ID help
 

*correction - KDA w175 2 is in the pass side, top on axle tube

Re: Axle GM 12 Bolt Rear end ID help
 

Perfect thank y’all. And how about the year? Is 1965 correct?

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?

Re: Axle GM 12 Bolt Rear end ID help
 

Its a plug weld. nothing to worry about....

Re: Axle GM 12 Bolt Rear end ID help
 

Agreed...its where the axle tube is welded to the differential housing

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

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

Re: Axle GM 12 Bolt Rear end ID help
 

I'd go Yukon gears...