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Transmission & Driveline Transmissions and Differentials

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  #1  
Old Sep 22nd, 08, 7:09 PM
blubu blubu is offline
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Larry Joe
 
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Default GM 12 bolt hsg

I have a 12 bolt hsg and cant figure out what year it is ???
The casting number 3894939 the other side there is a GM-8
I cant find anymore how about measurements??????
Any help would be great
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  #2  
Old Sep 22nd, 08, 8:06 PM
LS7 LS7 is offline
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Default Re: GM 12 bolt hsg

3894939-1967 Link to Dales site>

http://www.chevellestuff.com/qd/gene..._axle_info.htm

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

http://www.chevellestuff.com/tech/rear_end_widths.htm

Last edited by LS7; Sep 22nd, 08 at 8:16 PM. Reason: spelling
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Old Sep 23rd, 08, 8:16 AM
Verle Verle is offline
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Verle
 
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Default Re: GM 12 bolt hsg

There should be a casting date on the center section of the form:

A217 - Jan 21 1967
E37 - May 3 1967

Post that information.
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Old Sep 23rd, 08, 5:51 PM
blubu blubu is offline
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Larry Joe
 
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Default Re: GM 12 bolt hsg

Quote:
Originally Posted by Verle View Post
There should be a casting date on the center section of the form:

A217 - Jan 21 1967
E37 - May 3 1967

Post that information.
I will check but according to the casting number 3894939 it is the early version of a 67 with flat perches Which would also explain someone welding some tophat looking holders on plate for rear spring
I never could figure out that that was about,?
Since someone had converted it to a leaf spring leaving the eyes on top and left over bottom tabs I want to convert it back for my car even though I will need a 10 bolt hsg to rob for perches Try to keep pinion angle the same it would make a nice addition for my car. Thanx Guys
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Old Sep 23rd, 08, 10:47 PM
tlowe tlowe is offline
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Default Re: GM 12 bolt hsg

the 939 housing can also be a 68. check the date casting. tom
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