drive train

[69 ss hugger]

Heres all the info from my car:
Vin:124379N562385
ST6912437 NOR 208374 BDY
TR 711 72 72 PNT
12B X11

Motor:9N562385T1207HB
Trans:19N562385 Pan:Y9 S 29D
Rear End: BP1215 2 cant tell whats in between the 5 and 2 if any. 10 bolt non posi 2:73

[KurtS]

Thanks!
I still don't understand the 10 bolt in it. Unusual since all other L48/M38 cars have a 12 bolt.
Or it got swapped and the date happened to be perfect for the car, which I kinda doubt.

[JKZ27]

Does that axle date seem a bit late for the car? I compared it to my 12B car #5583xx.
Engine:TII29HA
Axle: BS1121G 2
           E
Ofcourse, thats assuming mine is original.

For comparison
John

[fiveforty]

How can a rear end that was built on Dec 15th go into a car that was built the 2nd week of Dec?

[Tinkerr]

fiveforty
i don't know where you got your info,but mines says BS=69 3:31 posi 1121=11th month 21=21st day G=gear assembly plant 2=second shift E=eaton posi 

[fiveforty]

I was asking about 69 ss huggers. The first post in this topic that is where I got my info from.

[JohnZ]

It would have been possible for a 12B body to show up on the Chevrolet side of the plant as late as December 18th, so a December 15th axle isn't out of the question. 12B is the week when the raw body started in the Body Shop at Fisher Body, not when the car was produced at Chevrolet. 

[KurtS]

It is very late for that car. He originally posted on camaros.net.
My response was:
That axle date is *really* close. So close that I'd say it's possible that it's original. If so, it's the only exception I've seen in 69.
GM docs do indicate that all 69 L48 autos were to get 10 bolts, but that's not what happened.

[69 ss hugger]

I dont know 2 many people that would keep a car all together,and get rid of a 12bolt and replace it with a 10bolt.

[69 ss hugger]

If u dont think it right.What do u think it should have? What do u think the date code should B? and a 12bolt with what gears did they run? Can u find these 4 sale?I would rather have a 12bolt.  THANKS MIKE

[KurtS]

>and get rid of a 12bolt and replace it with a 10bolt.
And replace it with a 10 bolt that is perfectly dated.

Reread my posts. I believe it probably is original.
An SS auto would have 3.07 gears as standard. 2.73 would be the economy gear.

[69 ss hugger]

Sould it b a posi?And what would u do if it was your car leave the 10bolt in it?I see u guys call it a L48 car what does that mean?I THANK ALL OF U FOR THE HELP  MIKE.

[KurtS]

Posi was an option.
I'd leave it.
L48 = 350/300 hp engine

[69 ss hugger]

Thanks for the help kurt i app. it MIKE.

[cib12]

guess i need to check my car-(pre x code-marked X 1) rs- ss350 air cond- it has a 10 bolt pos- i just assumed it had been swaped out- especially even 30 years ago it was a lot harder to find  a 12 bolt pos and if you did it was more money-- 12 bolt from a junk yard( if i can remember) seemed to run 250- 500 and at the time a 10 bolt could be bought for as little as a 100-150- and most yards did not even look if it was pos track

[ko-lek-tor]

I know this is a really old post regarding rear axles. Two questions arose regarding :1) 12 Bolt usage,2) Dated components vs. TT build date). I could have and probably should have started a new post, but felt knowing what prompted me to post was relevant. I really do not have a question, but merely wanted to add my observations from my three '69's. I figure the more information shared helps paint a mosaic of  the assembly practices. Hopefully, information divulged will not be used for fraudulent purposes. I have 3 Norwood built cars. 11D,12B,3E. The first 2 are SS cars with 12 bolts. the 11D is an L48 auto, BS1118(Nov18), The 12B has M20, BS1122 (Nov22). My 1st point is : These 2 cars have 12 bolts as expected and although there are 2 weeks + in build dates of the cars and over a spread of 13,000+ cars built in that period, there are only 2 days between build dates of axles.  The second point is: This regards my 3rd car, a 307 4speed 10 bolt. My 3E car (5th week of March) has a 10 bolt with build date of 0407 (April 7)! I don't know how much expediting went on back then, but safe to say some component dates can be real close. This car, although started on the Fisher side 3E (only 1 day in 5th week of March, I believe, but could have included 1st week of April), still could not have left plant any earlier than the 7th of April. I will also just note that according to CRG month by month production #'s by vin, This car was almost #5000 into the April Vin dates. So having a cowl tag date is not an absolute as to when component dates cut off. John Z has pointed out that Camaro production was 912 Camaros a day at Norwood (not sure if this applies by this date with Firebird production) . This would mean by Vin. this car was made possibly on 5th production day of April (excluding weekend) which was April 7th (Monday). Could the axle have been delivered and installed to Norwood the same day it was built? The car probably sat another day (8th) till rear was installed.