Author Topic: 1969/1970 12 bolt rear service replacement part? 3969341NF  (Read 2558 times)

Badshifter

  • Member
  • ***
  • Posts: 63
    • View Profile
I was just given a 12 bolt pulled from an ex race car and want to see if I've decoded the numbers correctly. It's just the housing, no gears, axle or diff.
Casting Number 3969341NF - late 69 early 70?
Casting Date C190 - March 19th 1970?
Axle Tube stamp C OS (or) C QS 0421G2 - OS (QS) 2:56 4WD (4 wheel disc?) April 21st Detroit Gear 2nd shift?

Is the 4WD indicative of a Service Replacement Part?

Thank you for any help.

1969 Z28 X77 09C

KurtS

  • CRG Coordinator
  • *****
  • Posts: 5884
    • View Profile
Re: 1969/1970 12 bolt rear service replacement part? 3969341NF
« Reply #1 on: May 31, 2022, 03:59:04 PM »
1970 3.07 axle.
Kurt S
CRG

Badshifter

  • Member
  • ***
  • Posts: 63
    • View Profile
Re: 1969/1970 12 bolt rear service replacement part? 3969341NF
« Reply #2 on: June 01, 2022, 01:34:19 AM »
Thank you Kurt.
1969 Z28 X77 09C

Rossterman

  • Newbie
  • *
  • Posts: 3
    • View Profile
Re: 1969/1970 12 bolt rear service replacement part? 3969341NF
« Reply #3 on: November 08, 2022, 08:28:59 PM »
Correct for a 70 SS camaro

ko-lek-tor

  • Hero Member
  • *****
  • Posts: 1858
  • someday I'll get one finished
    • View Profile
Re: 1969/1970 12 bolt rear service replacement part? 3969341NF
« Reply #4 on: November 10, 2022, 02:07:12 AM »
Most likely Nova. Measure length. Here is a chart:
Bentley to friends :1969 SS/RS 396 owned 79
1969 SS 350 (sold)
1969 D.H.COPO replica 4spd. owned since 85
1967 302 4 spd 5.13

bertfam

  • Hero Member
  • *****
  • Posts: 4492
    • View Profile
Re: 1969/1970 12 bolt rear service replacement part? 3969341NF
« Reply #5 on: November 10, 2022, 02:33:05 AM »
Quote
Most likely Nova.

COS is a 1970 3.07 Camaro axle.

Ed

rare396bronze

  • Member
  • ***
  • Posts: 281
    • View Profile
Re: 1969/1970 12 bolt rear service replacement part? 3969341NF
« Reply #6 on: November 10, 2022, 02:53:44 AM »
You beat me to it Ed. There is no CQS listed in Chevrolet by the numbers. But COS is listed as Camaro 3.07. Nice find. 70 12 bollts are hard to find since they did away with the 12 bolts on Camaro after 1970.

 

anything