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Identity of rear axle: 1956 Dodge Sierra 270 V8 Automatic
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Avanti
Posted 2022-12-01 11:44 PM (#626030)
Subject: Identity of rear axle: 1956 Dodge Sierra 270 V8 Automatic


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While on the hoist it appears the rear axle is a sure grip with a 4:10 ratio Looks like this old Sierra wagon had towing in mind. Only numbers I can detect are 1141644

Any ideas? I'm not a MOPAR expert. Thank You Kindly
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geoffs60
Posted 2022-12-02 2:07 AM (#626033 - in reply to #626030)
Subject: RE: Identity of rear axle: 1956 Dodge Sierra 270 V8 Automatic


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Thats a very low diff ratio esp for an auto V8.
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56D500boy
Posted 2022-12-02 2:22 AM (#626034 - in reply to #626030)
Subject: RE: Identity of rear axle: 1956 Dodge Sierra 270 V8 Automatic



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The axle ratio is stamped on the pinion gear carrier. Mine (56 Dodge V8 Custom Royal Powerflite) was 3.54. There was a 4.1 but typically that was for manual transmission cars with over drive. That said, 4.1 might have been available as an option for hilly country.





Edited by 56D500boy 2022-12-02 2:29 AM




(RearAxelRatiosAsAFunctionOfTheTransmission.jpg)



Attachments
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Attachments RearAxelRatiosAsAFunctionOfTheTransmission.jpg (180KB - 72 downloads)
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Powerflite
Posted 2022-12-02 9:36 AM (#626035 - in reply to #626030)
Subject: Re: Identity of rear axle: 1956 Dodge Sierra 270 V8 Automatic



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A picture or two might help to identify. I say that because sure grip didn't come out until 1958, so whatever it is, it isn't stock.
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StillOutThere
Posted 2022-12-02 12:06 PM (#626039 - in reply to #626030)
Subject: Re: Identity of rear axle: 1956 Dodge Sierra 270 V8 Automatic



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While "Sure Grip" as a marketing label was on the option list for 1958, the same unit was available from introduction about mid 1957 model year and simply known for what it is: a limited-slip differential. Several Imperials and Chryslers and a few DeSotos are known to have been ordered with the option.
But, granted, 1956 Mopar axles are different in construction and dimensions. I don't know of any Chrysler products with limited slip prior to 1957.

" Packard pioneered the LSD under the brand name "Twin Traction" in 1956, becoming one of the first manufacturers. " https://gaukmotors.co.uk/post/limited-slip-differential-lsd
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60 dart
Posted 2022-12-02 6:02 PM (#626042 - in reply to #626030)
Subject: RE: Identity of rear axle: 1956 Dodge Sierra 270 V8 Automatic



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Avanti - 2022-12-01 11:44 PM

While on the hoist it appears the rear axle is a sure grip with a 4:10 ratio Looks like this old Sierra wagon had towing in mind. Only numbers I can detect are 1141644

Any ideas? I'm not a MOPAR expert. Thank You Kindly



what leads you to believe its a sure grip?
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Avanti
Posted 2022-12-03 12:19 AM (#626052 - in reply to #626030)
Subject: Re: Identity of rear axle: 1956 Dodge Sierra 270 V8 Automatic


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Thank you to 60 Dart, Powerfllite, 56D500boy and all who replied. I was wrong and confused. Using photo above and holding one wheel as suggested, I have a 3.54 open rear end (so marked) so a 8 1/4 rear end. Again, thank you again I appreciate it.
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Avanti
Posted 2022-12-03 12:19 AM (#626053 - in reply to #626030)
Subject: Re: Identity of rear axle: 1956 Dodge Sierra 270 V8 Automatic


Member

Posts: 30
25
Thank you to 60 Dart, Powerfllite, 56D500boy and all who replied. I was wrong and confused. Using photo above and holding one wheel as suggested, I have a 3.54 open rear end (so marked) so a 8 1/4 rear end. Again, thank you again I appreciate it.
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