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???

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

Re: Help with rear axle code
 

I need this info but the link is dead now....arrrgh!!!!!

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

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.

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

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)

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!!

Re: Help with rear axle code
 

It is a 6 lug, 3.73 should be nice with my overdrive. Thank you!
Posted via Mobile Device

Re: Help with rear axle code
 

My Hollander interchange manual lists it as a 70 3:73 open.

Re: Help with rear axle code
 

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

http://i163.photobucket.com/albums/t...r/IMAG0708.jpg

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?

Re: Help with rear axle code
 

Book says 1972 3.73 open (non-posi).

Re: Help with rear axle code
 

Here is what was stamped on mine...
It's a 3:07 Posi now ;)

Re: Help with rear axle code
 

Great thanks...just wanted an idea before I popped to take a look...

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

Re: Help with rear axle code
 

Bump. I have a 72 with rha code. Hoping someone has a definitive source.
Posted via Mobile Device

Re: Help with rear axle code
 

RHA= 1972, 3:07 ratio (Source: Hollander interchange manual)

Re: Help with rear axle code
 

Thank you!!!
Posted via Mobile Device

Re: Help with rear axle code
 

RHA, '72 CS/CE10 3.07:1 Chevrolet Parts Manual

Re: Help with rear axle code
 

How about this one?

RA 0208 W2

Re: Help with rear axle code
 

Both 68 and 69 used RA for the 3.07 open for a Series 10.

Re: Help with rear axle code
 

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

Re: Help with rear axle code
 

C10/G10 1968 or 69 open 3.07:1 ratio, February 8th, Warren Plant, 2nd shift.

Re: Help with rear axle code
 

Gmpartswiki.com will answer all your decoding questions.
Posted via Mobile Device