71 rear end

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Jul 18, 2017 | 05:05 PM

jst2gtby

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Intermediate

Joined: Jun 2015

Posts: 45

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71 rear end

Hi everyone,
So I've done some searching but can't seem to find an answer to my question which is, what gearing is in my diff. Assuming the internals haven't been changed out and solely based on the stamps on the casing. Hope someone here can shine some light. Thanks fellas.

Dave.

Jul 18, 2017 | 05:10 PM

Alan 71

Team Owner

Joined: Sep 2006

Posts: 31,273

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From: Westminster Maryland

Hi Dave,
The rear differential assembly information, date, plant, and original ratio were stamped on the underside of the case on the rear flange.
The letters indicate the ratio.
Regards,
Alan

Here you can see the stamp info beginning with LR… 1971 car, 3.36:1 positraction

Last edited by Alan 71; Jul 18, 2017 at 05:23 PM.

Jul 18, 2017 | 11:21 PM

jst2gtby

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Awesome! Thanks for the reply. LRW 174 E1.

Last edited by jst2gtby; Jul 18, 2017 at 11:22 PM.

Jul 19, 2017 | 06:33 AM

Alan 71

Team Owner

Joined: Sep 2006

Posts: 31,273

Likes: 4,366

From: Westminster Maryland

Hi Dave,
Nice!

LR….3.36:1 positraction
W….Warren Motive
174….Julian date, 174th day of the year…June 23rd
E….Positraction Source… Eaton
1….Plant Shift

E281….Casting date for differential case…May 28th

Is your car quite a late car? Near the end of 71 production?
The differential dates would seem to indicate that.
Regards,
Alan

Last edited by Alan 71; Jul 19, 2017 at 06:34 AM.

Jul 19, 2017 | 01:17 PM

jst2gtby

Thread Starter

Intermediate

Joined: Jun 2015

Posts: 45

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Alan, you are the man! I will double check the build date on the car. Thanks again bud.

Dave

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