69 12 bolt identification - Page 2

**Too Many Projects** · #1 12-11-2025, 02:08 PM

Quote:

Originally Posted by Mike L78

The rear has a casting # 3894860N does this indicate a posi ?

No, a posi code would be included with the assembly code with an E as you have in the first pic.

**WILMASBOYL78** · #2 12-11-2025, 02:10 PM

That is the casting number for the 12 bolt center section....68-69 Nova and Camaro

The posi designation is in the stamp on the tube...there will be an E below the gear ratio and date. the E stands for Eaton Posi...of course, you should always look inside to confirm what is in there.

**WILMASBOYL78** · #3 12-11-2025, 02:15 PM

Mike...

One more thing...should have clarified...the BT code actually designates the posi from the factory...the E indicates the supplier of the unit. If you look at Colvin's book you will see a listing for all the possible codes and applications.

Tom

**Mike L78** · #4 12-15-2025, 01:57 PM

I picked up the 12 bolt it’s in nice shape not all pitted up . The casting date is I so it goes along with the September BT stamp.Thanks for the help
I am looking at Lakewood traction bars the kind with J Bolts and they extend in back with another clamp.I am trying to verify they are Camaro/nova . I will post some pictures.
Can anyone tell me anything about the leaf springs pictured? 5 leaf? GM or aftermarket?

**Mike L78** · #5 12-15-2025, 05:43 PM

Any info on the traction bars?Will they fit 69 nova

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