Rear Axle Codes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rsavage · 01-31-2010, 06:26 PM

Does anyone have the info to decode the axle codes that are stamped on the top of the left hand tube of the rear end for all years (67-72) including Burbs? I found some info but it only included 67 and 68-nothing for my 1970 trucks.

**john** · 01-31-2010, 08:39 PM

Post the numbers. someone will decode them.

rsavage · 01-31-2010, 10:46 PM

The code on the tube is TDE. I searched the web some more tonight and found an answer to someone's question on that rear axle code on a build sheet and the answer was a 3.07 gear. Don't know for sure if that is correct. Truck had a 307 with a 4 speed.

**john** · 02-01-2010, 02:40 PM

You are correct. 3.07:1 for code TDE if the gears haven't been changed.

1955 mancave · 10-28-2012, 05:12 PM

help please.

how about g
BXG0141

SS Tim · 10-28-2012, 05:59 PM

Quote:

Originally Posted by rsavage

Does anyone have the info to decode the axle codes that are stamped on the top of the left hand tube of the rear end for all years (67-72) including Burbs? I found some info but it only included 67 and 68-nothing for my 1970 trucks.

If you are going to do any real detective work a parts manual is a good reference to have. Axle and engine codes are only a small fraction of the useable data. Now since I have posted links several times to a parts catalog and the GM parts Wiki I'm going to make you work just a bit. So go to the link and read, if you must shortcut down to post #17. Remember parts manuals are like a new language if you have not been exposed to them before.

http://67-72chevytrucks.com/vboard/s...16#post5668516

http://www.gmpartswiki.com/browse

rt65s · 04-09-2013, 06:05 PM

I have 12 bolt rear end with this code stamped on the right tube:

HE121W

Any info. would be great, thanks

**john** · 04-09-2013, 06:29 PM

It looks like code HE is a 3.07:1 ratio. It is still a good idea to pull the cover and put some fresh oil in. You can check the no's stamped in the ring gear at the same time.

rt65s · 04-09-2013, 07:44 PM

Can you tell what year from this code HE121w

It has a hole cast into the pumpkin for the panhard bar.

**john** · 04-09-2013, 07:52 PM

Quote:

Originally Posted by rt65s

can you tell what year from this code he121w

it has a hole cast into the pumpkin for the panhard bar.

1965-1966

rt65s · 04-09-2013, 11:59 PM

Do you know when the 12 bolt rear end went to 30 spline axles?

rt65s · 04-20-2013, 03:03 PM

Found another 12 bolt posi but want to know what year. This is stamped on the pass. side tube: HC0829W The ring gear is stamped 381778 11 41 GM 8 66 1. Any help would be great. Thank you for your help.

SS Tim · 04-20-2013, 04:02 PM

67 3.73 posi

aggie91 · 07-02-2013, 06:56 PM

I am trying to ID a rear end housing that I have. The code on the passenger side tube is:

HA02 17W

On the driver side I found an 88 stamped on the tube.

I don't care what gears or if it is a posi, I am just looking for the year model. I know it is a 12 bolt, with an Eaton Posi carrier and 4.10 Richmond gears. The housing appears to be a 65-72 since there are torch marks at an angle from cutting off the pads on the tubes.

Any info on this would be great.

SS Tim · 07-02-2013, 07:09 PM

HA 65-69 3.73
0217 built February 17th
W by Warren Gear

aggie91 · 07-03-2013, 08:50 AM

Thanks Tim!

thekid54 · 09-01-2013, 09:08 PM

Any help with this code: RAC 054W81? Thanks in advance!

SS Tim · 09-01-2013, 09:27 PM

How does a 72 CA30/PA30 4.57 open HO72 sound to you?

thekid54 · 09-01-2013, 10:00 PM

Hmm, my rear end is a 12 bolt & currently has a 2.76 in it (I understand it could have been changed somewhere along the line) and I have no idea where it came from. HO72 looks like a 10 bolt. Pardon my ignorance, but what's a CA30/PA30 model?

SS Tim · 09-01-2013, 11:58 PM

Sure would have been easier if you had mentioned that up front.
The application I gave was for a 72 C30 1-ton truck or a P30 1-ton step van. Since you have a 12 bolt (now stated) I spent some time looking for you. GM parts wiki is showing RAC as a 78 C10 12-bolt open 2.76 axle. There very well might be others.

Here are some links if you want to look around. Sorry, my connection is not fast enough nor do I have the time for most non-67-72 requests that are outside stock applications.

http://www.gmpartswiki.com/getpage?pageid=60434

http://www.gmpartswiki.com/getpage?pageid=60426

thekid54 · 09-02-2013, 02:17 AM

Sorry for the lack of info, I didn't realize the code would span across two different types of axles. Thanks a lot for the info!

davbowen · 10-10-2013, 07:01 PM

Quote:

Originally Posted by rt65s

Can you tell what year from this code HE121w

It has a hole cast into the pumpkin for the panhard bar.

mine has code HE807W. I think it a 65 with 3.73 gears

can someone verify this. it's my 63 1/2ton and i'm looking to rebuild it. don't know if its 17 or 30 spline.

**john** · 10-10-2013, 07:58 PM

Quote:

Originally Posted by davbowen

mine has code HE807W. I think it a 65 with 3.73 gears

can someone verify this. it's my 63 1/2ton and i'm looking to rebuild it. don't know if its 17 or 30 spline.

Correct 1965 c-10 w/3.73:1 ratio.

davbowen · 10-10-2013, 08:58 PM

Quote:

Originally Posted by john

Correct 1965 c-10 w/3.73:1 ratio.

thanks john, that's good news. it should have 30 spline axles in it. I assume that the carrier in it will only fit 3.73 and up gears, 4 series. but since i'm looking for a posi I should be able to get a truck unit for 3 series gears, correct. the 3.73 are just to much for the th350. thinking about a 3.08 or a 3.42 to calm it down a bit.

**First c10** · 04-08-2015, 10:34 AM

I know this is an old thread but didn't want to start a new thread.

I picked up this rear end to rebuild for the truck. I know it is a 12 bolt but can someone decode the stampings please?

01-31-2010, 08:39 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Rear Axle Codes Post the numbers. someone will decode them. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

01-31-2010, 10:46 PM	#3
rsavage Registered User Join Date: Aug 2009 Location: Alden NY Posts: 2,705	Re: Rear Axle Codes The code on the tube is TDE. I searched the web some more tonight and found an answer to someone's question on that rear axle code on a build sheet and the answer was a 3.07 gear. Don't know for sure if that is correct. Truck had a 307 with a 4 speed. __________________ 1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7

02-01-2010, 02:40 PM	#4
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Rear Axle Codes You are correct. 3.07:1 for code TDE if the gears haven't been changed. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

10-28-2012, 05:12 PM	#5
1955 mancave Registered User Join Date: Jul 2011 Location: Scottsdale Az. Posts: 325	Re: Rear Axle Codes help please. how about g BXG0141

04-09-2013, 06:05 PM	#7
rt65s Registered User Join Date: Apr 2013 Location: Carnation WA Posts: 4	Re: Rear Axle Codes I have 12 bolt rear end with this code stamped on the right tube: HE121W Any info. would be great, thanks

01-31-2010, 06:26 PM	#1
rsavage Registered User Join Date: Aug 2009 Location: Alden NY Posts: 2,705	Rear Axle Codes Does anyone have the info to decode the axle codes that are stamped on the top of the left hand tube of the rear end for all years (67-72) including Burbs? I found some info but it only included 67 and 68-nothing for my 1970 trucks. __________________ 1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7

04-09-2013, 06:29 PM	#8
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Rear Axle Codes It looks like code HE is a 3.07:1 ratio. It is still a good idea to pull the cover and put some fresh oil in. You can check the no's stamped in the ring gear at the same time. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

04-09-2013, 07:44 PM	#9
rt65s Registered User Join Date: Apr 2013 Location: Carnation WA Posts: 4	Re: Rear Axle Codes Can you tell what year from this code HE121w It has a hole cast into the pumpkin for the panhard bar.

04-09-2013, 11:59 PM	#11
rt65s Registered User Join Date: Apr 2013 Location: Carnation WA Posts: 4	Re: Rear Axle Codes Do you know when the 12 bolt rear end went to 30 spline axles?

04-20-2013, 03:03 PM	#12
rt65s Registered User Join Date: Apr 2013 Location: Carnation WA Posts: 4	Re: Rear Axle Codes Found another 12 bolt posi but want to know what year. This is stamped on the pass. side tube: HC0829W The ring gear is stamped 381778 11 41 GM 8 66 1. Any help would be great. Thank you for your help.

04-20-2013, 04:02 PM	#13
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Rear Axle Codes 67 3.73 posi __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

07-02-2013, 06:56 PM	#14
aggie91 I'm just glad to be here! Join Date: Jan 2008 Location: Longview, TX Posts: 4,788	Re: Rear Axle Codes I am trying to ID a rear end housing that I have. The code on the passenger side tube is: HA02 17W On the driver side I found an 88 stamped on the tube. I don't care what gears or if it is a posi, I am just looking for the year model. I know it is a 12 bolt, with an Eaton Posi carrier and 4.10 Richmond gears. The housing appears to be a 65-72 since there are torch marks at an angle from cutting off the pads on the tubes. Any info on this would be great. __________________ Karl 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square

07-02-2013, 07:09 PM	#15
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Rear Axle Codes HA 65-69 3.73 0217 built February 17th W by Warren Gear __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

07-03-2013, 08:50 AM	#16
aggie91 I'm just glad to be here! Join Date: Jan 2008 Location: Longview, TX Posts: 4,788	Re: Rear Axle Codes Thanks Tim! __________________ Karl 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square

09-01-2013, 09:08 PM	#17
thekid54 Registered User Join Date: Jan 2006 Location: LA, CA Posts: 296	Re: Rear Axle Codes Any help with this code: RAC 054W81? Thanks in advance! __________________ Panel Beaters C.C.



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09-01-2013, 09:27 PM	#18
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Rear Axle Codes How does a 72 CA30/PA30 4.57 open HO72 sound to you? __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

09-01-2013, 10:00 PM	#19
thekid54 Registered User Join Date: Jan 2006 Location: LA, CA Posts: 296	Re: Rear Axle Codes Hmm, my rear end is a 12 bolt & currently has a 2.76 in it (I understand it could have been changed somewhere along the line) and I have no idea where it came from. HO72 looks like a 10 bolt. Pardon my ignorance, but what's a CA30/PA30 model? __________________ Panel Beaters C.C.

09-01-2013, 11:58 PM	#20
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Rear Axle Codes Sure would have been easier if you had mentioned that up front. The application I gave was for a 72 C30 1-ton truck or a P30 1-ton step van. Since you have a 12 bolt (now stated) I spent some time looking for you. GM parts wiki is showing RAC as a 78 C10 12-bolt open 2.76 axle. There very well might be others. Here are some links if you want to look around. Sorry, my connection is not fast enough nor do I have the time for most non-67-72 requests that are outside stock applications. http://www.gmpartswiki.com/getpage?pageid=60434 http://www.gmpartswiki.com/getpage?pageid=60426 Attached Images __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

09-02-2013, 02:17 AM	#21
thekid54 Registered User Join Date: Jan 2006 Location: LA, CA Posts: 296	Re: Rear Axle Codes Sorry for the lack of info, I didn't realize the code would span across two different types of axles. Thanks a lot for the info! __________________ Panel Beaters C.C.

04-08-2015, 10:34 AM	#25
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,706	Re: Rear Axle Codes I know this is an old thread but didn't want to start a new thread. I picked up this rear end to rebuild for the truck. I know it is a 12 bolt but can someone decode the stampings please? Attached Images __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

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