Rear Axle housing Decode Help

[jim28607]

Any Help with this Number ? located front of passenger side axle tube.

Thank You,
Jim

[KurtS]

The format was used in the 70's. Probably a 10 bolt, right?

[jim28607]

 

The format was used in the 70's. Probably a 10 bolt, right?

  BOOOO, I hope not , but I will sure investigate

Thank you for your input
Jim

[bertfam]

I agree with Kurt, and will go further and state the axle was assembled on the 177th day of the year, at the Detroit Gear and Axle plant during the 2nd shift, but I'll darned if I can find any GM car that used an MC axle code!

Also, I can't tell from the picture, but is there something else stamped after the 2?

Ed

[rare396bronze]

1967-1969 Chevy truck 4.57 ratio. Got this out of a old Hollinder Interchange book from my old junk yard day's.

[cook_dw]

1967-1969 Chevy truck 4.57 ratio. Got this out of a old Hollinder Interchange book from my old junk yard day's.

[bertfam]

1967-1969 Chevy truck 4.57 ratio.

I know absolutely nothing about trucks, but did they use this format in 67-69? (ratio code - assembly plant - Julian date - shift)

Ed

[bcmiller]

Jim check the casting number on the center section. And post a pic of the rear cover if you can.

Yes MC was used for some trucks/vans in the late 60s.

Not sure about 67 or 69 but yes for 68.

http://www.gmpartswiki.com/getpage?pageid=21082

[1968 Z28]

Yes MC was used for some trucks/vans in the late 60s.

Not sure about 67 or 69 but yes for 68.

http://www.gmpartswiki.com/getpage?pageid=21082

It appears that in this chart the "MC" is assigned to a Series 30 (G30) heavy duty axle.

[Kelley W King]

I am thinking that G30 would be a 1 ton van?

[jim28607]

I've definitely got some research to do , I think the axle tubes have been changed because there is diff grease leaking from both sides at the third member!!!!
Car has really wide rear tires , so I'm thinking it's been narrowed.
More pics coming  and I am great full for your input

Jim

[bcmiller]

Yes MC was used for some trucks/vans in the late 60s.

Not sure about 67 or 69 but yes for 68.

http://www.gmpartswiki.com/getpage?pageid=21082

It appears that in this chart the "MC" is assigned to a Series 30 (G30) heavy duty axle.

If it's what I think it is, then yes.

[bcmiller]

I've definitely got some research to do , I think the axle tubes have been changed because there is diff grease leaking from both sides at the third member!!!!
Car has really wide rear tires , so I'm thinking it's been narrowed.
More pics coming  and I am great full for your input

Jim

Possible but extremely unlikely. No reason to change tubes and if they did that, new tubes would most like have been used. A quick look at the cover will tell us a lot.

[jim28607]

Jim check the casting number on the center section. And post a pic of the rear cover if you can.

Yes MC was used for some trucks/vans in the late 60s.

Not sure about 67 or 69 but yes for 68.

http://www.gmpartswiki.com/getpage?pageid=21082

  Here are pics of cover  and some numbers I found.

What is it?

Thanks All.
Jim

[bcmiller]

Well that appears to be a late 69 and 70 passenger car 12 bolt.

Is there a casting date in the webbing area at the edge of the center section? From the rear look at the upper drivers side. Might be something like H 10 9

Go to this link and scroll down for casting date location.

http://www.camaros.org/drivetrain.shtml#axle

Look close at that stamped MC again. Could it be CMC ? With the first C spaced over a little?