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Differential code stamping
Posted by: Mel ()
Date: April 19, 2006 05:00PM

I got 8 trans and diff units the other day and I have been trying to identify the gear ratio by the code numbers stamped into diff housing. Some are stamped and others are blank, is this normal??? thanks Cordell

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Re: Differential code stamping
Posted by: donmanen ()
Date: April 19, 2006 05:36PM

The only way to be sure which ratio you have now is count the teeth---I have moved many gears from earlier cases to '64 cases and never changed the coding on the case-you might have one of my old units...... I recently found a case marked HN--- couldn't wait to get it out of the car to be sure it WAS a 3:08---now it's moved to a '64 case and going in my new project--guess I should change the designator on that one....

DM.

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Re: Differential code stamping
Posted by: beaminscott ()
Date: January 04, 2009 03:11PM

Does anyone have a picture of an LM diff where the stamp is visible? I am able to easily find the stamp on the EM diff but not having any luck on the LM's. Thanks, Scott

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Re: Differential code stamping
Posted by: Tom Z ()
Date: January 05, 2009 06:37AM

here's a pic of a 65 diff,right-side near the middle,and trans gasket..good luck reading it,tho..

Tom Z,,Rochester NY

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Re: Differential code stamping
Posted by: beaminscott ()
Date: January 05, 2009 07:31AM

Thank you Tom, a picture is worth a thousand words. One of mine has a PG and I think the modulator will partly cover up the code and that has been my issue.

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Re: Differential code stamping
Posted by: danielmorsk ()
Date: January 05, 2009 07:44AM

Here are 2 photos of my 65 diff case. The stamping is hard to see in the photo.
Mine reads- AB 12 05
Not sure what this means exactly.

The diff was a non posi with 3.55 gears.

Hope this adds some help.

Daniel M
65 140/4 coupe
61 Rampside 110/4
Stanwood Wa

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Re: Differential code stamping
Posted by: Spectre ()
Date: January 05, 2009 09:06AM

AB: 1965-69 manual transmission, non-posi.

See bottom of page for all the listings: [www.corvair.com]

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Norman, OK

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Re: Differential code stamping
Posted by: danielmorsk ()
Date: January 05, 2009 09:46AM

Thanks Dave
I have seen that page before in the Clarks book.
It is good info!

Daniel M
65 140/4 coupe
61 Rampside 110/4
Stanwood Wa

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Re: Differential code stamping
Posted by: bought1 ()
Date: January 05, 2009 09:59AM

Hmmm...just looked at mine. Says HQ and has32 teeth on the ring gear, suggesting 3.55 manual for 64 van. Obviously from another vehicle since its in my 64 convertible. Oh well...

Dave

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Re: Differential code stamping
Posted by: bbodie ()
Date: October 15, 2020 06:08AM

Here is an image with enhanced detal fromthe earlier post...

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Re: Differential code stamping
Posted by: MattNall ()
Date: October 15, 2020 09:42AM

Brad, Welcome to the CCF! This topic is from 2009. No need to comment. That info is now in our FAQ's

Start a new TOPIC and intro yourself!

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Differential code stamping
Posted by: wittsend ()
Date: October 15, 2020 11:34AM

One more reason to check. I have a HF case which is listed as a 3.89 but the math on 9/32 says 3.55. My Lakewood was only 12 years old in 1973 (that would be a 2008 car in current time) when it was last on the road but the car had already had many changes.

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