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Old 06-16-2007, 08:51 PM   #1
retro69
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Help with rear axle code

Rear axle code on right passenger side says RHA W330 1; what is the rear axle ratio for this code???
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Old 06-17-2007, 11:00 AM   #2
Livrat
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Re: Help with rear axle code

that is a 1972 3:07 ratio..
Here is a link.. srcoll down to axle codes and click on year

http://www.americanclassic.com/paint.htm?p1=axles

Last edited by Livrat; 06-17-2007 at 11:01 AM.
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Old 07-14-2011, 08:16 AM   #3
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Re: Help with rear axle code

I need this info but the link is dead now....arrrgh!!!!!
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Old 07-14-2011, 08:21 AM   #4
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Re: Help with rear axle code

a code that was stamped 40years ago is not always what is inside now alot of times// a simple rear fluid change will give you a foolproof answer
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Old 07-14-2011, 08:31 AM   #5
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Re: Help with rear axle code

True enough, I am pretty sure this is an unmolested truck though, as far as the rear axle. I plan to pull the cover soon and change gear oil but I have a lot to get done before I get around to it. I really would like to find a ratio code chart.
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Old 07-14-2011, 11:31 AM   #6
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Re: Help with rear axle code

Yes that site is dead, I now have an interchange manual that lists the codes, post up your axle code and I can tell you what it originally was
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Old 07-14-2011, 12:03 PM   #7
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Re: Help with rear axle code

Its a 70 pickup TDA. I found another post after I did a search that said it is a 3.73. Im guessing its an open (peg leg)
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Old 07-14-2011, 12:26 PM   #8
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Re: Help with rear axle code

You are both correct, the GM parts manual says that is a 1072 3.07 (open) for CS/CE, and the same stamp was used in 1970 for a 3.73 (open). Therefore, if it is a 6-lug, it's probably the 3.73 and if it is a 5-lug it's probably a 3.07.

Good Luck!!
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Old 07-14-2011, 12:29 PM   #9
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Re: Help with rear axle code

It is a 6 lug, 3.73 should be nice with my overdrive. Thank you!
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Old 07-14-2011, 10:12 PM   #10
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Re: Help with rear axle code

My Hollander interchange manual lists it as a 70 3:73 open.
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Old 11-03-2011, 03:16 PM   #11
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Re: Help with rear axle code

any help with a 72 rearend stamped RHC W126 1 Thanks in advance...

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Old 11-03-2011, 03:29 PM   #12
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Re: Help with rear axle code

[QUOTE= a simple rear fluid change will give you a foolproof answer[/QUOTE]

Please explain, what would one look for?
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Old 11-03-2011, 03:33 PM   #13
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Re: Help with rear axle code

Book says 1972 3.73 open (non-posi).
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Old 11-03-2011, 03:36 PM   #14
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Re: Help with rear axle code

Here is what was stamped on mine...
It's a 3:07 Posi now
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Old 11-03-2011, 03:53 PM   #15
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Re: Help with rear axle code

Great thanks...just wanted an idea before I popped to take a look...
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Book says 1972 3.73 open (non-posi).
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Old 04-08-2012, 01:10 PM   #16
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Re: Help with rear axle code

Need a bit of help, have a 1970 C-10 that I have reason to believe was swapped to a 71 Frame, dash sheet says automatic & had to cut a bellhousing crossmember out that was riveted in, disc brakes, and rear lug studs for a 70 didn't fit but 71's did, as well as a 71 type grill, & am noticing looseness in the rear end, anyway it is 5 lug with coils and the number on pumpkin is 3896838 and code on tube is RHA W143 1
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Old 09-01-2012, 09:37 PM   #17
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Re: Help with rear axle code

Bump. I have a 72 with rha code. Hoping someone has a definitive source.
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Old 09-01-2012, 10:08 PM   #18
Livrat
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Re: Help with rear axle code

RHA= 1972, 3:07 ratio (Source: Hollander interchange manual)
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Old 09-01-2012, 10:11 PM   #19
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Re: Help with rear axle code

Quote:
Originally Posted by Livrat View Post
RHA= 1972, 3:07 ratio (Source: Hollander interchange manual)
Thank you!!!
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Old 09-02-2012, 02:53 AM   #20
SS Tim
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Re: Help with rear axle code

RHA, '72 CS/CE10 3.07:1 Chevrolet Parts Manual
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Old 09-28-2012, 02:11 PM   #21
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Re: Help with rear axle code

How about this one?

RA 0208 W2
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Old 09-28-2012, 02:25 PM   #22
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Re: Help with rear axle code

Both 68 and 69 used RA for the 3.07 open for a Series 10.
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Old 09-28-2012, 03:09 PM   #23
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Re: Help with rear axle code

Quote:
Originally Posted by Rich916 View Post
Please explain, what would one look for?
On the edge of the ring gear there are going to be some numbers. There will be two numbers separated by a colon (. These numbers indicate the number of teeth on the pinion and the ring gear.

For example, mine is stamped 11:41. 41 divided by 11 equals 3.7272, so it's a 3.71:1 gear ration
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Old 09-28-2012, 10:22 PM   #24
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Re: Help with rear axle code

Quote:
Originally Posted by JaxsDad View Post
How about this one?

RA 0208 W2
C10/G10 1968 or 69 open 3.07:1 ratio, February 8th, Warren Plant, 2nd shift.
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Last edited by SS Tim; 09-28-2012 at 10:30 PM.
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Old 09-28-2012, 11:48 PM   #25
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Re: Help with rear axle code

Gmpartswiki.com will answer all your decoding questions.
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