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Canadian Poncho Homepage -> Canadian Poncho -> Beaumont Power Train Tech Forum -> 12 BOLT I.D.
Post Info TOPIC: 12 BOLT I.D.
68 427


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12 BOLT I.D.
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CAN ANYONE TELL ME WHAT THIS REAR-END IS OUT OF AND WHAT GEARS WERE IN IT ORIGINALY. GOT IT FROM A 64 CHEVELLE AND CURRENTLY HAS 4:56 RATIO.
         STAMPED:   KT  1201  B
                                    E
               CAST:    GM7    3894939

THANX

 MIKE

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Using this link...

http://www.chevellestuff.com/1967/rear_axle.htm

early '67 Chevelle
3.07 Posi
originally w/ Metallic Brakes
Buffalo axle plant
built Dec. 1'st 1966

smile.gif

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Beaumont4008


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KT   67 chevelle 307 gears

12 01  Dec.  1st day of the month

B  assy plant Buffalo

E  Eaton Positrac



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427carl


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good score  biggrin    good job GP

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Beaumont4008


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Looks like you beat me to it Pete. I used my Chevy by the numbers book but I like your link, good info there. Keeping that on favorite list.

Ian K.

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68 427


Poncho Master!

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 THANX GUYS. WOULD THIS BE ONE OF THE WIDER REARS OR BECAUSE IT'S AN "EARLY" PART WOULD IT STILL BE NARROW?

 MIKE


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Beaumont4008


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Its a 67 so from Axle tube flang to axle tube flange should be 54-1/4 in. The 68 and up are 55-1/4 in. So that would make it one inch narrower.

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68 427


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THANX AGAIN.

 MIKE

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4SPEED427


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I see the KT code in the book for 66 as well. Is there some way to tell if it's 66 or 67 by the date code? I have never seen that listed anywhere if there is.

The 66 should have a flat pad with a bolt hole in the center where the bottom of the coil spring sits. The 67 has a raised mound for the bottom of the coil to sit on. Which does your's have?

The 66 and 67 diffs should be identical except for this mounting pad.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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Carl...

Aren't the casting #'s different for '66?.

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4SPEED427


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I wish the parts book had casting numbers but it doesn't. Does the Chevy by the Numbers book list it that way? I have no doubt it is correct, I had just never heard that before.


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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
Beaumont4008


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Carl Stevenson wrote:

I wish the parts book had casting numbers but it doesn't. Does the Chevy by the Numbers book list it that way? I have no doubt it is correct, I had just never heard that before.


For some reason my book is lacking the casting numbers for the diff's housing's.
It list a few but not in detail, but goes more in detail on the decoding of the buildcodes. It does say there is a casting date you should compare with the build date. There must be a casting date on it. That and the style of spring purch should  help.

 Chevy by the numbers has casting numbers up the wazoo but comes to the diff and kind of lame. 

wonder if GM7  the 7 meaning the year of casting ?

-- Edited by Beaumont4008 on Wednesday 8th of April 2009 05:54:21 PM

-- Edited by Beaumont4008 on Wednesday 8th of April 2009 05:56:19 PM

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68 427


Poncho Master!

Status: Offline
Posts: 1986
Date:
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Carl Stevenson wrote:

I see the KT code in the book for 66 as well. Is there some way to tell if it's 66 or 67 by the date code? I have never seen that listed anywhere if there is.

The 66 should have a flat pad with a bolt hole in the center where the bottom of the coil spring sits. The 67 has a raised mound for the bottom of the coil to sit on. Which does your's have?

The 66 and 67 diffs should be identical except for this mounting pad.


 CHECKED LAST NIGHT, HAS THE RAISED MOUNTS FOR THE SPRINGS. MEASUREMENT IS 54 1/4".

  MIKE



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427carl


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Carl Stevenson wrote:

I wish the parts book had casting numbers but it doesn't. Does the Chevy by the Numbers book list it that way? I have no doubt it is correct, I had just never heard that before.



 Casting Numbers:
12-Bolt Housing: Casting
1965 Chevelle 3859140N
1966 Chevelle 3875745N
1967 Chevelle 3894939N
1967 Chevelle-Late 3917124NF
1968-Early 1969 Chevelle 3917124NF
1969 Chevelle 3959038NF
1970-72 Chevelle 3969278NF
1970-72 Chevelle 3969278



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694279


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HI  IS IT FOR SALE  

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68 427


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 SORRY, NOT FOR SALE.

  MIKE

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