De-code my axle please. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

-sean- · 02-23-2011, 12:16 AM

New (to me) C10 that has been touched more than a few times so I'm trying to figure out just what it has in it since the PO had now idea.

The pass side axle tube code is: RHA W 146 1

Duncan and son · 02-23-2011, 12:23 AM

What year is the truck?

-sean- · 02-23-2011, 12:37 AM

Quote:

Originally Posted by Duncan and son

What year is the truck?

It's a 69 C10.

Livrat · 02-23-2011, 01:03 AM

It comes up as: RHA = 1972 ... 3:07

VA72C10 · 02-23-2011, 01:29 AM

Quote:

Originally Posted by Livrat

It comes up as: RHA = 1972 ... 3:07

where did you decode that at? I would love to check my four current rear axles to verify gears w/out tearing open the covers....

**Dave** · 02-23-2011, 01:49 AM

If you have a GM truck parts book, vintage '78 print date, starting on page 61and continuing to page 68, it has a complete rear axle id chart with ratios per the code. VA72C10 pm me your axle codes and I'll look'em up.

Livrat · 02-23-2011, 01:57 AM

There used to be a website I used, but it is no longer functioning.. It just happened to be I had copied a few down when I was looking for a few of my codes..
If you can find a Hollander interchange manual that covers our years, It also has the infomation

Here are the few I have
RHA= 1972 3:07.1
RHC= 1971 3:73.1
THC = 1971 3:73.1
You can also go to GMC pauls website for 67/68 codes

VA72C10 · 02-23-2011, 01:59 AM

Quote:

Originally Posted by Dave

If you have a GM truck parts book, vintage '78 print date, starting on page 61and continuing to page 68, it has a complete rear axle id chart with ratios per the code. VA72C10 pm me your axle codes and I'll look'em up.

Quote:

Originally Posted by Livrat

There used to be a website I used, but it is no longer functioning.. It just happened to be I had copied a few down when I was looking for a few of my codes..
If you can find a Hollander interchange manual that covers our years, It also has the infomation

Here are the few I have
RHA= 1972 3:07.1
RHC= 1971 3:73.1
THC = 1971 3:73.1
You can also go to GMC pauls website for 67/68 codes

Thanks guys!!! And I'll get those codes soon and send em to you Dave. Thanks!

For reference since others will read this....is there a code for posi? I know two of mine are.....

**Dave** · 02-23-2011, 02:06 AM

Great, glad to do it.

-sean- · 02-23-2011, 11:42 AM

Thanks for the help!

smorg007 · 02-23-2011, 12:09 PM

Are these codes stamped in the housing? If so approx. where and are they on the front or rear side of axle.

mcbassin · 02-23-2011, 12:11 PM

What about later model diff. housings? are they coded the same way? If so, is there a place on the net to decode them? thanks

**Dave** · 02-23-2011, 12:25 PM

Here's what the GM book says about rear axle code id's:

Chevy/GMC single speed truck-- Stamped on forward upper surface of differential carrier housing.
Hope this helps ya.

c1069 · 02-23-2011, 01:23 PM

Quote:

Originally Posted by smorg007

Are these codes stamped in the housing? If so approx. where and are they on the front or rear side of axle.

Mine are on the right tube, top of the axle.

-sean- · 02-23-2011, 01:59 PM

Mine were on the passenger side tube located forward, towards the top, right in the middle of the tube.

smorg007 · 02-23-2011, 06:56 PM

So here is a pic of mine just where you said it would be. Stamped in passenger side tube in the middle towards the top. So I take it just means it's a 1972 with 307 gears because of the "RHA". Do the other numbers mean anything.

02-23-2011, 12:16 AM	#1
-sean- Registered User Join Date: Jul 2008 Location: Colorado Posts: 484	De-code my axle please. New (to me) C10 that has been touched more than a few times so I'm trying to figure out just what it has in it since the PO had now idea. The pass side axle tube code is: RHA W 146 1

02-23-2011, 12:23 AM	#2
Duncan and son Registered User Join Date: Sep 2009 Location: Lubbock Texas Posts: 1,049	Re: De-code my axle please. What year is the truck? __________________ You can shear a sheep every year, but you can only skin it once The person dealing with facts is never at the mercy of the person dealing with theory 1972 Cheyenne Super 402 400 A/c bucket seat tilt custom camper Longhorn 1975 Silverado 454 Crew cab camper special dually

02-23-2011, 01:03 AM	#4
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: De-code my axle please. It comes up as: RHA = 1972 ... 3:07

02-23-2011, 01:49 AM	#6
Dave DND Trucks Join Date: Dec 1999 Location: NW Indiana Posts: 2,400	Re: De-code my axle please. If you have a GM truck parts book, vintage '78 print date, starting on page 61and continuing to page 68, it has a complete rear axle id chart with ratios per the code. VA72C10 pm me your axle codes and I'll look'em up.

02-23-2011, 01:57 AM	#7
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: De-code my axle please. There used to be a website I used, but it is no longer functioning.. It just happened to be I had copied a few down when I was looking for a few of my codes.. If you can find a Hollander interchange manual that covers our years, It also has the infomation Here are the few I have RHA= 1972 3:07.1 RHC= 1971 3:73.1 THC = 1971 3:73.1 You can also go to GMC pauls website for 67/68 codes

02-23-2011, 02:06 AM	#9
Dave DND Trucks Join Date: Dec 1999 Location: NW Indiana Posts: 2,400	Re: De-code my axle please. Great, glad to do it.

02-23-2011, 11:42 AM	#10
-sean- Registered User Join Date: Jul 2008 Location: Colorado Posts: 484	Re: De-code my axle please. Thanks for the help!

02-23-2011, 12:09 PM	#11
smorg007 Registered User Join Date: May 2010 Location: Redding, Ca Posts: 371	Re: De-code my axle please. Are these codes stamped in the housing? If so approx. where and are they on the front or rear side of axle.

02-23-2011, 12:11 PM	#12
mcbassin Still Learning Join Date: Jul 2009 Location: Central Oklahoma Posts: 10,108	Re: De-code my axle please. What about later model diff. housings? are they coded the same way? If so, is there a place on the net to decode them? thanks __________________ Mike "69 Short Wide" My Project 86 Silverado Landen's Project Instagram: @mcbassin My Website C/10 Club Oklahoma Facebook Group Last edited by mcbassin; 02-23-2011 at 12:12 PM.

02-23-2011, 12:25 PM	#13
Dave DND Trucks Join Date: Dec 1999 Location: NW Indiana Posts: 2,400	Re: De-code my axle please. Here's what the GM book says about rear axle code id's: Chevy/GMC single speed truck-- Stamped on forward upper surface of differential carrier housing. Hope this helps ya.

02-23-2011, 01:59 PM	#15
-sean- Registered User Join Date: Jul 2008 Location: Colorado Posts: 484	Re: De-code my axle please. Mine were on the passenger side tube located forward, towards the top, right in the middle of the tube. Last edited by -sean-; 02-23-2011 at 01:59 PM.

02-23-2011, 06:56 PM	#16
smorg007 Registered User Join Date: May 2010 Location: Redding, Ca Posts: 371	Re: De-code my axle please. So here is a pic of mine just where you said it would be. Stamped in passenger side tube in the middle towards the top. So I take it just means it's a 1972 with 307 gears because of the "RHA". Do the other numbers mean anything. Attached Images



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