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Date code K149 Casting code 3969341NF Numbers on tube C BS 1124G1 E. Wondering if anybody could tell me what this rearend is originally out of. Thanks.
 

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K149
K=November
14=14th day
1-1971

C= Buffalo Assembly plant

BS= 4.10 ratio
112= 112th day of the year
G=Detroit Gear & Axle
1=first shift
E= Eaton Posi traction unit

The 3969341NF keeps coming up as correct for 71 Camaro SS & Z28 or Nova SS
This is a HP unit for sure!

Someone know more! And someone is looking for one of these! If this is correct!

Al
 

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71 camaro rear and 71 nova rear do not interchange because the 71 camaro 12 bolt rear width is about 2 inches wider than the 71 nova 12 bolt rear...
 

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12 bolt axle..

CBS tube stamp is a one year only code....1970 model year Nova 12 bolt.....3.31 posi.

Date stamp on the casting is 11/14/69 casting number is correct for 1970 12 bolt..

Axle tube stamp is 11/24/69

These dates make sense for that time frame...

Chevy added the "C" to the beginning of the tube stampings for 1970....the "C" is often slightly offset or positioned a little to the left of the "BS" part of the stamp...in prior years the code would have just been"BS".

This axle code would have most likely been in an L-34 BB or a SB Super Sport car.

wilma
 

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The 3969341NF keeps coming up as correct for 71 Camaro SS & Z28 or Nova SS
71 camaro rear and 71 nova rear do not interchange because the 71 camaro 12 bolt rear width is about 2 inches wider than the 71 nova 12 bolt rear...
There was no 12-bolt available in teh 1971 Camaro. 1970 was the last year of a 12-bolt in a Camaro.

CBS tube stamp is a one year only code....1970 model year Nova 12 bolt.....3.31 posi.

Date stamp on the casting is 11/14/69 casting number is correct for 1970 12 bolt..

Axle tube stamp is 11/24/69

These dates make sense for that time frame...

Chevy added the "C" to the beginning of the tube stampings for 1970....the "C" is often slightly offset or positioned a little to the left of the "BS" part of the stamp...in prior years the code would have just been"BS".

This axle code would have most likely been in an L-34 BB or a SB Super Sport car.

wilma
^^^ I totally agree. The C prefix gives this away as a 1970 rear. CBS was not a Camaro code but was a code for Novas (3.31 posi). That rear was standard in a 1970 Nova SS with either an L48 350 4-speed or an L34 396 with a manual trans (3 or 4 speed).
 
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