Rear Axle Casting Number location
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abajc3
Mcarlo77
6 posters
G3GM :: G3 Tech :: Engine & Driveline
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Rear Axle Casting Number location
by 77mali Mon Aug 22, 2011 8:23 pm
Ok, so I picked up my Haynes Chevelle book and am looking up where to find the rear axle casting #/stamp. I looked at the pic in the book (which says.."Typical Rear Axle Casting Number Location") but I think the darn Pic is posted upside down...or might be one of those darn G-Bodies. Anyway I looked for the stamp and did not find it easily. Sprayed w/ wd40 also to cut through some of the crud. Can anyone post a pic of theirs or let me know where to look for a 77...I'm a bit lost. I have a posi but am not 100% sure it's original to the car so trying to find out what I have to work with.
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Re: Rear Axle Casting Number location
by Mcarlo77 Mon Aug 22, 2011 9:13 pm
Don't have a pic of mine, but my 1977 Chevrolet Service Manual describes it as "axle identification number located on the front of the right axle tube, about (3) inches outboard from the differential cover. A typical code number is HKB 218 D W."
Hope this helps.
Hope this helps.
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Re: Rear Axle Casting Number location
by 77mali Mon Aug 22, 2011 9:20 pm
TY. Will look again or use more cleaner. Still confused though if it's outboard from the diff cover then shouldn't it be the rear of the axle tube? I assume that the cover is what bolts on to the back of the Diff, no? 
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Re: Rear Axle Casting Number location
by Mcarlo77 Mon Aug 22, 2011 9:40 pm
Suppose you have to eyeball the right edge of the differential cover from the front of the axle tube. Take a wire wheel or Dremel and try cleaning some of the rust off and let me know if you find it. I'm too lazy to go out and put mine up on the ramps so I can crawl under there.
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Re: Rear Axle Casting Number location
by JB2wheeler Tue Aug 23, 2011 9:48 am
Its almost half way between the pumpkin and the brake backing plate on right side of car facing front of car. I sanded mine down with steel wool and used clear gloss spray can on it to make it easier to see next time. In my case it did me no good because later on I replaced everything internally. JB
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Re: Rear Axle Casting Number location
by 77mali Tue Aug 23, 2011 10:21 am
Found it......AD 1 219 ( I think). Looked in the forum and found page w/ ratio & rpo codes etc....
No "AD" for 77 but found in 1976...3.08 ratio? No Posi? Now i'm even more confused.
No "AD" for 77 but found in 1976...3.08 ratio? No Posi?
Now i'm even more confused.
77mali- Donating Member
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Re: Rear Axle Casting Number location
by abajc3 Tue Aug 23, 2011 12:26 pm
77mali wrote:Found it......AD 1 219 ( I think). Looked in the forum and found page w/ ratio & rpo codes etc....
No "AD" for 77 but found in 1976...3.08 ratio? No Posi?
a nice big burnout should clear all doubts regarding the posi
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Re: Rear Axle Casting Number location
by 77mali Tue Aug 23, 2011 1:10 pm
AD K 219. Used the good flashlight.
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Re: Rear Axle Casting Number location
by The Dude Tue Aug 23, 2011 2:02 pm
https://www.g3gm.com/Chevrolet-Rear-End-Codes-h25.htm
It's a rear axle built between 1973 & 1976 with 3.08 open rear & was assembled in Canada on August 7th, unless it was a leap year, then it was assembled on August 6th.
Pop open the rear diff & count the gears if you want to be sure. A gasket only costs a couple of dollars, there's only 10 bolts, & it's a good reason to clean all of the gunk out & put new fluid in. Post up a pic if you are unsure of which posi has been installed. Someone could tell you if you are running an lsd, locker, or spool. You could also spin the ring gear around & read the numbers on it to tell your ratio.
It's a rear axle built between 1973 & 1976 with 3.08 open rear & was assembled in Canada on August 7th, unless it was a leap year, then it was assembled on August 6th.
Pop open the rear diff & count the gears if you want to be sure. A gasket only costs a couple of dollars, there's only 10 bolts, & it's a good reason to clean all of the gunk out & put new fluid in. Post up a pic if you are unsure of which posi has been installed. Someone could tell you if you are running an lsd, locker, or spool. You could also spin the ring gear around & read the numbers on it to tell your ratio.
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Re: Rear Axle Casting Number location
by 77mali Tue Aug 23, 2011 2:52 pm
Thanks Rago...It'll be a while but had intended on doing that anyway. will post a pic here at a later date. Too much going on w/ it right now. trying to find a starter and get her up to temp to do a leakdown test.
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Re: Rear Axle Casting Number location
by pila Tue Aug 23, 2011 10:47 pm
Sometimes the number of teeth for ring & pinion are stamped in the outer edge of the ring gear.
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Re: Rear Axle Casting Number location
by 77mali Thu Aug 25, 2011 9:36 pm
Will a 3.08 handle 425 horsepower?
77mali- Donating Member
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