69 Camaro 12-Bolt Posi

[69L78]

I have a 12-bolt posi that came out of a 69 Camaro, but all the numbers don't correspond for a 69. The code on the axle tube is BS W0221 E, which shows it's a 3.31 posi for a 69 Camaro. The center section casting # is 3969341NF, with a F180 date code, which says it's from a 70 Camaro. The dimensions of this rear is definitely for a 69; the measurement between the axle tube flanges is 54 1/4", and the measurement between the centerline of the spring seats is 42 7/16". Can anyone explain this? By the way, if anyone is interested this rear is for sale or trade.

[lowmile]

The 67-69 Camaro and 68-72 Nova rears are 53 1/4 flange to flange and the 70 up Camaro is 1 inch wider 54 1/4 (1/2 wider per side). The 70 up will physically fit in the earlier cars but can cause a clearance problem with a wide wheel tire combo but works fine with factory wheels. Mark

[69L78]

According to Chevrolet by the numbers the measurement for 67-69 camaro and 68-72 nova's between the flange's is 54 1/4 and the measurement for the 70 Camaro is 55 1/4.

[lowmile]

Taken from Novaresource.com

Rear Axle Dimensions
1968-1979 Nova

A 42 3/4", B 53 1/4", C 60 1/4"

A = Mounting plate (center to center)
B = Backing Plate to Backing Plate
C = Wheel mounting surface (drum to drum)

It's to dang cold to go out to my shop tonight. I'll measure tomorrow. m

[berger]

jeff if your car is a late sept/oct build you probably got 70 codes even though your parts were built mid to late 69' my pop is full of 70 codes for my09d 69' x66, I too have a 3.31 BS rear on pop, its written as BS0909G, sept ,9th 69' but written as a 70 cuz' car is so late, you may have a three letter block if engine is orig.

[Mr70]

Thats correct,they premiered the new 70 Camaros in Feb. 1970.
So how can the casting date,which says June 18 1970,and should be the earliest of the rearend dates,be after the date of the Ratio code of BS Feb. 21,which is a 1969 suffix,not a 70.

[69L78]

I do not have the car this rear came out of. I bought this rear 15 yrs ago and its been lying here in my shop, I'm tired of falling over it, so I would like to sell it. My problem is when I tell someone I have a 69 12-bolt for sale and they ask for the date code and its F180 I never hear back from them.

[WILMASBOYL78]

You sure that zero is not a nine??

[69L78]

The date is definitely F180 and on the other side is CON2, with the # 65 above it in large numbers. This rear has a very nice casting with no pitting there is no mistaking the #'s, they are very bold. What does the CON2 represent?

[Kurt S]

[ QUOTE ]
The code on the axle tube is BS W0221 E, which shows it's a 3.31 posi for a 69 Camaro. The center section casting # is 3969341NF, with a F180 date code, which says it's from a 70 Camaro. The dimensions of this rear is definitely for a 69.....

[/ QUOTE ]

The axle is a 70 part, out of a Nova. But that code isn't right. Shouldn't have a W in it. A 70 Nova code would be CBS.