Team Camaro Tech banner
1 - 6 of 6 Posts

·
Registered
Joined
·
63 Posts
Discussion Starter · #1 ·
I have a 12 bolt out of a 67 RS/SS with the square radius rod and I need help decoding the diff gears. There's a number stamped on the outside rim of the large gear. It's 2GM 3862691 14 43 5 67. The stamp on the 12 bolt housing is Q5 05 12 G2.

Three questions: 1. What is the actual gear ratio? 2. Is it a Posi? 3. Could it be the original gears for this rearend?

Thanks for your help.

Jay
GR868
 

·
Registered
Joined
·
437 Posts
Jay,
It is 3.07 gears. Others may correct me, but I think the 3862691 is the GM PN, 14 43 is 14 teeth on the pinion, 43 on the ring gear (43 divided by 14 = 3.07) the 5 67 should be May 1967.
 

·
Registered
Joined
·
4,761 Posts
Jay it's probably "QS" and not "Q5", and that indicates a 3.07 Non-Posi 12 bolt with metallic brakes. Yours was assembled on May 12th, 1967 at the Detroit Gear and Axle plant on the 2nd shift.

Original to your car? Depends on the build date of your car. Post the VIN and the Trim Tag info and we can tell you more.

Ed
 

·
Registered
Joined
·
63 Posts
Discussion Starter · #5 ·
Thanks for the info, it's much appreciated.

No, it's not out of my car. But I know the car very well. It was built in June of 67.

Is the non-posi correct for an RS/SS 350?

Thanks again.

Jay
GR868
 
1 - 6 of 6 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top