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TommySS454

Can anyone ID this rear end?

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I know this isn't the correct rear end for my car, but can anyone identify it? It's a 12 bolt. IMG_20191231_140037173.thumb.jpg.28cfde3251b299093a3c98a36a402444.jpgHere's the tube stamp.

Thanks

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No Chevelle ever had a rear with the "RC" code.

Can you tell us any more? What year do you think it is?

Can we see more pics, including the cover?

The 0515 is a date code but it's meaning changed through the years.

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All I can find is that its an Olds diff with 3:08's inside. Oldsmobile delta 88's or the Jetstar..as far as thew RC code goes. the 05 15K would think its the 15th of November but the 05 is weird...

Darren

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Don't have a close up picture of the cover but I will attach a pic that you can zoom in to it. Looks like an ordinary 12 to me.  All I will say is I put this rear end in after the previous one wore the trailing arm bolt holes to a nice oval shape. It wasn't the factory unit either. But my dad owned a salvage yard so this was already pulled out. I walked over to a selection of 12 bolts and picked one that was maybe a dozen years ago. Thanks for the replies.

IMG_20191228_163513626.jpg

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I wasn't having luck finding anything online, that's why I posted here. Thought maybe I was a moron and wasn't looking it up right.

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From the "K", I can say this rear was manufactured by McKinnon Industries.

Tommy, see if you can get the casting number. It's on the front webbing of the cast center section.

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I have it written down at home. I'll get it in the morning. My vision is fixing to get blurry.

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May sound stupid, but what if the guy on the line stamped it backwards? "CR" would be a 3.07 posi according to a couple of lists out there.

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That could be Joe.

Tommy, while you're at it, measure how wide it is from axle flange face to axle flange face.

Here's some numbers:

Widths:

1964 - 1967: 60.5 inches
1968 - 1972: 61.25 inches

Casting numbers found to be the most prevalent in Chevelle 12-bolt rear ends:

1965 Chevelle 3859140N
1966 Chevelle 3875745N
1967 Chevelle 3894939NF
68-69 Chevelle 3917124NF
1969 Chevelle 3959038NF
70-72 Chevelle 3969278NF

 

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I haven't pulled the wheels off to measure yet. But the casting # is. 3917124N. 

IMG_20200101_132206925.jpg

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Pulled the cover and it appears to be a 3.07 ratio. 14 pinion teeth and 43 ring teeth.

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OK, I'm gonna go with what Joe said, that the stamper got the letters swapped when he stamped it.

The "CR" code would be a 1968 rear with the 3:07 ratio and the casting number.

It should measure 61.21 inches.

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That would make sense.  It's not the first time I've seen old G.M. stuff with funky numbers. Thanks for the research everyone.

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